Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
They had steam-power and even steam-driven atmosphere fliers, but they didn't have missile weapons and they did have a social system that humans simply couldn't accept—even though it applied only to Thrid. The ordinary Thrid, with whom Jorgenson did business, weren't bad people. It was the officials who made him grind his teeth. And though all the Thrid—and when Jorgenson finished his breakfast a high Thrid official waited in the trading-post compound. Around him clustered other Thrid, wearing the formal headgear that said they were Witnesses to an official act. Jorgenson went out, scowling, and exchanged the customary ceremonial Witness hats, became utterly silent. The high official made a sound equivalent to clearing his throat. The stillness became death-like. "On this day," intoned the high official, while the Witnesses have been his predecessors throughout the ages —on this day did the to and of the said Rim Stars Trading Corporation as they shall be and observe that anyone hindering this loyal and admirable gift must, by the operation of truth, vanish from sight and nevermore be seen face to face by any rational being." A part of this was reaction as a business man. A part was recognition of all the intolerable things that the Thrid took as a matter of course. If Jorgenson had reacted solely as a business man he'd have contradict him. It could even be dangerous. Jorgenson was in a nasty spot. The Witnesses murmured reverently: of the Rim Stars Trading Corporation to present to the great and fundamental fact in the culture of the Thrid. "Like hell you'll receive moneys and goods and such!" snapped Jorgenson. "Like hell you will!" not want to give him anything! What he has said is not true!" This was the equivalent of treason, blasphemy and the ultimate of indecorous behavior toward a virgin Pelean princess. "I won't give him anything! I'm not even vanishing from sight! Glen-U is wrong about that, too! Now—git!" Witnesses, some even losing their headgear in their haste to get away. Jorgenson stamped into the trading-post building. His eyes were stormy as he commanded the iron doors and shutters of the trading post closed, they obeyed. They saw him turn on the shocker-field so that nobody could cross the compound without getting an electric shock that would discourage him. They began to believe. Jorgenson laid the matter indignantly before him, repeating the exact phrases that said the trading company wanted—wanted!—practically to nevermore be seen face to face by any rational being. How does that hysterically to be allowed to go home before Jorgenson vanished, with unknown consequences for any Thrid who might be nearby. When Jorgenson opened a door to kick him out of it, the whole staff of the trading-post plunged after him. They'd been eavesdropping and they fled in pure horror. Jorgenson swore impartially at all of them and turned the shocker-field back on. He plugged in a capacity circuit which would turn on warning against a multitude. As a business man, he'd acted very foolishly. But he'd acted even less sensibly as a human being. He'd gotten fed up with a social system and a—call it—theology it wasn't his business to change. True, the Thrid way of life was appalling, and what had happened to Ganti was probably typical. But it wasn't Jorgenson's affair. He'd been unwise to let it disturb him. If the Thrid wanted things this way, it was their privilege. of criminals chained together and doing the most exhausting labor the supervision. If he could, the trading company could simply bring trade goods to Thriddar and take away other trade goods. The cost of doing to him, and he almost doubted that an official was necessarily right. When his former wife died of grief, his disbelief became positive. And weren't intelligent enough to see what a racket their government was. Now that the new Grand Panjandrum had moved against him, Jorgenson made an angry, dogged resolution to do something permanent to make matters better. For the Thrid themselves. Here he thought not as a business about it, and there was nothing he could do. He'd blundered, and it would soon be public knowledge. crime—or lunacy—of declaring the Grand Panjandrum mistaken. So by the operation of truth, which was really an anesthetic gas cloud drifted Thrid voice—amazingly, a familiar Thrid voice—said: "This is not good, Jorgenson. Who did you contradict?" carrying something. "It isn't worse," he said. "It's only as bad. They did drop food and water for both of us. I wasn't sure they would." His calmness sobered Jorgenson. As a business man, he was moved to make of his own reaction, which was not a business-like one at all. Then he said dourly: "But he's still wrong. No rational being is supposed ever to see me probably forgotten by now." He was calm about it. Only a Thrid would have been so calm. But they've had at least hundreds of generations in which to get used to injustice. He accepted it. But Jorgenson frowned. water. When the prisoner doesn't pick it up, they stop coming. When, presently, they have another prisoner they drop him off, like me, and it overboard as I did. They'll drop food and water for me until I stop picking it up. And presently they'll do the same thing all over again." Jorgenson glowered. That was his reaction as a person. Then he gestured sleeping purposes. Jorgenson ground his teeth a second time. "And just because they'd contradicted somebody who couldn't be wrong! Or because they had a business an official wanted!" "Or a wife," agreed Ganti. "Here!" felt such hatred of the manners and customs of the Thrid—which had put him here—that it seemed that something must somehow be possible if only so he could take revenge. dropped food and water, and went away. Once a water-bag burst when dropped. They lost nearly half a week's water supply. Before the copter something he'd never noticed before, he told of the incredible conditioning-education of the young members of his race. They learned that they must never make a mistake. Never! It did not matter if they were unskilled or inefficient. It did not matter if they accomplished nothing. There was no penalty for anything but making mistakes or differing from officials who could not make mistakes. So Thrid younglings were trained not to think not to have any opinion about anything only to repeat what nobody questioned only to do what they were told by authority. It occurred to Jorgenson that on a planet with such a population, a skeptic could make a great deal of confusion. Then, another time, Jorgenson decided to make use of the weathering lack of haste, with the lack of hope normal to prisoners to whom escape is impossible, even when they talk about escape. They could have been discussing a matter that would not affect either of them. But Jorgenson "We'll try it," said Ganti detachedly, when he'd explained again. "If it fails, they'll only stop giving us food and water." That, of course, did not seem either to him or Jorgenson a reason to hesitate to try what Jorgenson had planned. It was not at all a direct and forthright scheme. It began with the untwisting of more of the rope that had lowered Jorgenson. It went on with the making of string from that fiber. They made a great deal of piled so neatly. The copter came and dropped food and water. When it left, they practiced. When it came again they were not practicing, but when it of the technique. They experimented. They tried this. They tried that. When the copter appeared, they showed themselves. They rushed upon the dropped bag containing food and water as if fiercely trying to deny each other a full share. Once they seemed to fight over the dropped their practicing.

<question>:
What is the purpose of the Witnesses?

<options>:
A To observe and report those who challenge the supreme ruler
B To deliver scroll messages from the Never-Mistaken Glen-U
C To carry the elaborate vessels in which the supreme ruler travels
D To burden those they witness with social pressure

<answer>:

A