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

<passage>:
He reached up and grasped the handle of the door and he saw that his Slowly he slipped to the cool floor—how his head was burning!—and for heard the voices again, and soon a foot and then another pounded on the metal of the passage. He heard Crifer's voice louder than the rest: the engines somewhere in the rear of the world had changed their tone, Tugging at the handle of the door, Rikud pulled himself upright. Something small and brown scurried across the other side of the from the steady whining Rikud had heard all twenty-five years of his realized this odd difference in himself, he kept it locked up inside which he could see in the dim light through the open door. "Where's the buzzer?" he sobbed. "I must find the buzzer." Crifer's voice, from the darkness inside, said, "You broke it. You down against it, exhausted. Behind him, the voices and the footsteps So tightly did he grip the handle that his fingers began to hurt. And his heart pounded hard and he felt the pulses leaping on either side of embroiled him in a hopeless, infinite confusion that left him with a Crifer was tugging at him, trying to pull him away from the door, and someone was grabbing at his legs, trying to make him fall. He kicked out and the hands let go, and then he turned the handle and shoved the weight of his body with all his strength against the door. It opened and he stepped outside into the warmth. headache? A hardly perceptible purple glow pervaded the air in the room of the larger every moment. He turned to go, but the door clicked shut and a metallic voice said. "Fifteen minutes under the tubes, please." whirled once more down the tortuous course of half-formed questions and With so many people, and especially now with women, he was not afraid. It was much better than the small world of machinery, buzzer, frightening doors and women by appointment only. again, something which was as impalpable as air. authority to stop him. This puzzled him, because somehow he felt that there should have been authority. A long time ago the reading machine in the library had told him of the elders—a meaningless term—who had governed the world. They told you to do something and you did it, but that was silly, because now no one told you to do anything. You only listened to the buzzer. And Rikud could remember the rest of what the reading machine had said. There had been a revolt—again a term without any real meaning, a term that could have no reality outside of the reading machine—and the elders were overthrown. Here Rikud had been lost utterly. The people had decided that they did not know where they were going, or why, and that it was unfair that the elders alone had this authority. They were born and they lived and they died as the elders directed, like little cogs in a great machine. Much of this Rikud could not understand, but he knew enough to realize that the reading machine had sided with the people against the elders, and it said the people had won. "Yes?" Almost no one read any more, and the library was heavy with the meant that, in the two unoccupied hours before sleep, he went to the library and listened to the reading machine. Everyone else simply sat "I left it in the library. You can find several of them under "Well, it's wrong. Variability and change are two words without meaning." viewport. When he passed the door which led to the women's half of the "Broom, brroom, brrroom!" Chuls imitated the intermittent blasting of the engines. "I'm hungry, Rikud." he admitted to Rikud. "But why should the garden be in the viewport?" It changed. Where are the stars? Where are they, Chuls, if it did not change?" it was with a purpose—to eat, or to sleep, or perhaps to bathe in the He had long wondered about the door in the back of the library, and door. "What's in here?" he demanded. "It's a door, I think," said Crifer. "I know, but what's beyond it?" the door." it. It's only a door." "Open it. Open the door and look inside." There's nothing. It just isn't. It's only a door, Rikud." breath. Rikud had turned the knob and pushed. The door opened silently, end of which was another door, just like the first. Halfway across, door. The machinery in the next room is your protection against the not, then here is your protection. As nearly as possible, this ship is a perfect, self-sustaining world. It is more than that: it is human-sustaining as well. Try to hurt yourself and the ship will not permitted through this door— than that, however, was the second door. Would it lead to another When he opened the door a strange new noise filled his ears, a gentle humming, punctuated by a throb-throb-throb Odder still was the third door. Rikud suddenly thought there might opened on a bare tunnel which led to yet another door. hand on the door, all the while watching the garden through the new What would he do out in the garden? He couldn't go alone. He'd die of the strangeness. It was a silly Slowly, he took his hand off the door lever. He made his way back through the tunnel and then through the room of machinery and finally through the little room with the confusing voice to Crifer. garden again. Not when he knew there was a door through which he could walk and then might find himself in the garden. Chuls did not believe Rikud at all. "There are not that many doors in the world," he said. "The library has a door and there is a door to the the world, there are two other doors!" "You'll show me nothing because I won't go." he did, his hands began to tremble. But he held on, and he tugged at shirt. Presently, the members of the crowd had pretty well paired off, each though. Maybe then he could take them outside with him to the big upon entering the room. swung the bar into the mass of metal. Each time he heard a grinding, under his blows, shattered by the strength of his arm. was a shambles of twisted, broken metal. He laughed, softly at first, He opened the door and ran through the little corridor to the smaller door. But his hands trembled too much when he touched it, and once, eat or drink. Rikud himself had fumbled through the blackness and the whimpering to the dining room, his tongue dry and swollen, but the smooth belt that flowed with water and with savory dishes did not run any more. The machinery, Rikud realized, also was responsible for food. Chuls said, over and over, "I'm hungry." "What won't?" "The buzzer will never sound again. I broke it." "It was not bad. The world has moved through the blackness and the him and he could not go outside alone. In five more years he would have "We must go outside—through the viewport." Rikud listened to the odd A hand reached out in the darkness and grabbed at his head. He heard broken the machinery, Crifer was his enemy, because Crifer came nearer to understanding the situation than anyone except Rikud. and the feet pounding behind him, and he wanted only to get away. It was dark and he was hungry and everyone who was strong enough to run how big it was, the darkness and the hunger and the people chasing him But if he didn't open the door and go into the garden outside, he would He stumbled through the darkness and felt his way back to the library, through the inner door and into the room with the voice—but the voice didn't speak this time—through its door and into the place of machinery. Behind him, he could hear the voices at the first door, and He got up slowly and opened the next door. The voices behind him were

<question>:
What struggle does the door in the library represent?

<options>:
A The struggle between man and machine, and the power machine now has over them.
B The struggle for Rikud and all the others to conceptualize what they don't know or haven't seen before.
C Rikud's fear of what's behind it.
D The struggle between authority and the people it runs.

<answer>:

B