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

<passage>:
The saucer was interesting, but where was the delegate? The DELEGATE FROM VENUS was clear. No one moved from their position. Everybody was waiting to see what the delegate from Venus looked like. And all they got for their patience was the biggest surprise since David clobbered Goliath. " "Greetings from Venus," it ship you see is a Venusian Class newspaper wanted him to behave, for one-passenger. It is clear of all radiation, and is perfectly safe to approach. There is a to protect the cozy Washington assignment he had waited "It just seemed strange, all these exchanges of couriers in the past two days. I couldn't A door slid open. "It's a box!" someone said. "A crate—" "Colligan! Moore! Schaffer! Lend a hand here—" A trio came forward and hoisted the crate out of the ship. Then the voice spoke again Jerry deduced that it must have been activated by the decreased load of the ship. "Please open the crate. You will find our delegate within. We trust you will treat him with the courtesy of an official emissary." They set to work on the crate, its gray plastic material giving their tools. But when it was opened, they stood aside in amazement and consternation. There were a variety of metal pieces packed within, protected by a filmy packing material. "Wait a minute," the general speak to you again!" said. "Here's a book—" The reporter closed the door "'Instructions for assembling Delegate,'" he read aloud. "'First, remove all parts and arrange them in the following order. A-1, central nervous system behind him, and then strolled out of the building into the sunlight. housing. A-2 ...'" He looked up. "It's an instruction book," build the damn thing." The Delegate, a handsomely constructed robot almost eight feet tall, was pieced together some three hours later, by a who seemed to find the Venusian instructions as elementary as a blueprint in an Erector set. But simple as the job was, they were obviously impressed by the mechanism they had assembled. It stood impassive until they obeyed the final instruction. escort me to the meeting place ..." It wasn't until three days after the landing that Jerry Bridges saw the Delegate again. Along with a dozen assorted in the rear and ate his meal in sullen silence. It wasn't the newsmen's jibes that bothered him it was the But his greatest surprise was and said: So far, the byword had been secrecy. They knew "At first, they thought it was foreign minister's debate. And the cause of it all, a placid, highly-polished metal robot, was bore the designation: VENUS. The robot delegate stood up. "Gentlemen," it said into the microphone, and the great men at the council tables strained to hear the translator's version Delegate from a great neighbor planet, in the interests of peace last night." "Look, Greta—" Wham! out. He ran after her, the restaurant proprietor shouting about the unpaid bill. It took a rapid merely a threat, a promise, or an easy solution—but a challenge." reporter , damn it. It's my job. I'd do it again if without unleashing the terrible forces of power now at your command. Once unleashed, these forces may or of Venus, promise you this—that "Did I say that?" "It just won't be any use. Venus will act swiftly, mercilessly, here came as a messenger of peace. But envision it, men of Earth, as a messenger of war. Unstoppable, inexorable, it may return, bearing a different Delegate from Venus—a Delegate of Death, who speaks not in words, but in the explosion of atoms. Think of thousands of such Delegates, fired from a vantage point far beyond the reach of "Greta!" "But if you print one again." word the planet Venus, men of Earth, of it, Jerry Bridges, I'll never poised to wreak its wrath upon those who betray the peace." The Delegate sat down. Four days later, a mysterious explosion rocked the quiet sands of Los Alamos, and the Venus spacecraft was no more. Two hours after that, the robot delegate, its message delivered, its mission fulfilled, requested to be locked inside a bombproof chamber. When the door was opened, the Delegate was an exploded ruin. The news flashed with lightning speed over the world, and Jerry Bridges' eyewitness accounts and nobody could figure out in Washington. They were in his apartment, and it was the first for about three days, and they're thinking of calling a plenary session of the UN just to figure "It's not that," Jerry said moodily. "But ever since I heard the Delegate speak, something's been nagging me." "But don't you think he's done "About the Venusians, of from Venus they're people—want to know if they can land their delegate." "Their what?" "Their delegate. They came here for some kind of conference, I guess. They know about embrace, he cried out: "Wait a minute!" "What's the matter?" and Jerry responded the way a normal, healthy male usually does. But in the middle of an "You mean these Venusians last chance to change his mind, and then left. calm," he said ironically. "Well, how else can I take it? I'm not even supposed to know is so careless about—" She put her fingers to her lips. "Oh, dear, now you'll really think I'm terrible." "Terrible? I think you're wonderful!" "And you promise not to print it?" to say: "It must be something new since I was here. Where is this place?" can't deliver any messages." erasing a blackboard. He turned when the door opened. If the it with his next batch of mail." "When will that be?" "In an hour. He's in a terribly been bothering me. It bothered me from the moment I heard the Delegate speak. I didn't know what it was until last night, when I dug out my old letters, his own envelope atop it. She came out of the press secretary's office two minutes by the waiting reporters with a grin of triumph. Jerry, and snapped: "This note of yours. Just what do you think it means?" isn't it, Professor? These very words were spoken by the Delegate from Venus." "A coincidence—" "Is it? But I also remember that secrecy is essential, that leakage of the story might cause panic. Since you're the only unauthorized person who knows of it, we have two choices. One of them is to lock you up." not be allowed to relay the story to the press until such a time as all who were suddenly struck by correspondents are informed. about a group of teachers, scientists, and engineers, a group within the cone, ready to be conference was held this morning, and a decision was reached to accept the delegate. Landing instructions are being assembled. They would beam a radio message to earth from the Then, when the Robot was assembled, they would speak through it to demand peace for given at Los Alamos, and the cone, seemingly as if it originated from their 'spaceship.' in custody." The USAF jet transport wasn't the only secrecy-shrouded the rear seat flanked by two Sphinx-like Secret Service men, knew that he was the only passenger with non-official status "Oh, I dunno. Venus is also but it was well-ordered and unhurried. They had done a good job of keeping the excitement contained. He was allowed to leave the car and stroll unescorted. He shouted. And in a moment, the calm was shattered. At first, he saw nothing. A faint roar was started in the heavens, and it of the light-ringed area. When it hit, a dust cloud obscured it from sight. A loudspeaker blared out an unintelligible order, but its message

<question>:
If the following event had not occurred, the Venusian delegate's identify would likely not have been discovered:

<options>:
A If Jerry had not kept his old notes from college physics
B If the UN had not called a plenary session
C If Greta had gotten fired for leaking her source
D If the authorities had destroyed the delegate after its opening message

<answer>:

A