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

<passage>:
success or failure. Yet he could make no move, win that way, so let's leave the guns where they are." bracing him against the thrust of the rocket engines underneath, holding to the guide rail at the side of the ship's corridor. you turn our—shall I say, our A heavy-set man in blue appeared at the end of the connecting corridor. He was moving fast, but stopped short when he saw the two men. "Hey!" he said. "Change of course—get to your cabins." He seemed about to walk up to them, then reconsidered and hurried off. Neither man paid any attention. one-minute warning. The white-haired man cocked his eyebrow. money. Do you think—" have to kill you!" Already his hand was streaking toward the grip of his dis-gun, touching "Don't be a fool," he grated. "Duane—" will you listen to reason?" Duane panted. But he halted, and the muzzle of his weapon wavered. The floor swooped and surged beneath him as the thrust of the mighty jets was cut off. Suddenly there was no gravity. The two men, locked together, floated weightlessly out to the center of the corridor. "Course change!" gasped white-haired Stevens. "Good God!" The ship had reached the midpoint of its flight. The bells had sounded, warning every soul on it to take shelter, to strap themselves in their pressure bunks against the deadly stress of acceleration as the ship reversed itself and began to slow its headlong plunge into Callisto. But the two men had not heeded. The small steering rockets flashed briefly. The men were thrust bruisingly against the side of the corridor as the rocket spun lazily on its axis. The side jets flared once more to halt the spin, when the one-eighty turn was completed, and the men were battered against the opposite wall, still weightless, still clinging to each other, still struggling. Then the main-drive bellowed into life again, and the ship began to battle against its own built-up acceleration. The corridor floor rose up with blinking speed to smite them— And the lights went out in a burst of crashing pain for Peter Duane. stimulant, to help you throw off the shock of your—accident. You're "Hello," he whispered. "You—where am I?" "In the sick bay," she said. "You got caught out when the ship changed course. Lucky you weren't hurt, Peter. The man you were with—the old, white-haired one, Stevens—wasn't so lucky. He was underneath when the "Duane, Duane," a man's heavy voice said. "That won't wash. Don't play the way so permanently. Well, no matter. If you had to kill him, it's play tricks on me," he said savagely. "I haven't time for them. I won't mince words with you. Give me a release on the cargo now, before I have to get rough. This is a lot more important to me than your life is." something against me, save it. Wait till my head clears. I'm sure I can explain—" "Explain, hell." The dark man laughed. "If I wait, this ship will be blasting off for Ganymede within two hours. I'll wait—but so will the ship. It's not going anywhere till I give it clearance. I run Callisto I'll give the orders here!" II The crew of the rocket made no objection when Andrias and his men took out of sight as they left. A curt sentence to a gray-clad official on the blast field where the rocket lay, and the man nodded and hurried off, to tell the rocket's captain that the ship was being refused clearance indefinitely. while the two uniformed men shoved Duane into the back of the car, climbed in beside him. Andrias gave a curt order, and the car shot forward. under the dashboard. The high wail of a siren came instantly from the car's roof, and what traffic was on the broad, straight highway into which they had turned pulled aside to let them race through. the League police garrison—those who are loyal to the League, still, instead of to Andrias—he can sit back and laugh at any fleet Earth and Mars can send. Rockets are clumsy in an atmosphere. They're helpless. And if he can arm enough of Callisto's rabble, he can't be stopped. it back, pinned it down.... They had stopped in Darkside, the spaceport on the side of Luna that keeps perpetually averted from Earth, as if the moon knows shame and they're perfect. You know my price. Take it or leave it. And it's payable the minute we touch ground on Callisto. the thirty-foot length of the room, designed to imbue him with a sense of his own unimportance, as steadily as he'd ever walked in the open air of his home planet. The guard had remained just inside the door, at attention. Andrias waved him out. —the ship you came on. Sign it, and we'll forget our argument. Only, sign it now and get it over with. I'm losing patience, Duane." "Naturally," he said, "there will have to be a revision of terms. I it!" He hurled himself at Andrias, hands sweeping around to grapple for the own hands were diving for the twin heat guns that hung at his waist. Duane saw his danger, and reacted. His foot twisted around Andrias' ankle his earlier accident. But Andrias, unconscious already, tumbled back with Duane on top of him. His head made an audible, spine-chilling thud as it hit the carpeted floor. ," he thought. " I'm getting in a rut! " The problem of getting out was serious, he saw. How could one— III would get him out of a building that so closely resembled a fortress. He tumbled the things back into the drawers helter-skelter, turned get away and accomplish something, the mere lack of written permission would not keep him from the rocket's lethal cargo! at that face—even assuming that Andrias could have been forced to cooperate by the threat of a gun. Which, considering the stake Andrias " But still he had to get out. How? Once more he stared around the room, catalogued its contents. The guard would be getting impatient. Perhaps any minute he would tap the door, first timorously, then with heavier strokes. The guard! There was a way! There was only one way to find out. He walked around the desk to the bell cord. He took a deep breath, tugged it savagely, and at once was in speedy motion, racing toward the now he had two unconscious men on his hands and he dared let neither revive until he was prepared. He grasped the guard's arm and dragged him roughly the length of the room. He leaped on top of the desk, brutally scarring its gleaming top with the hard spikes of his boots. His agile fingers unfastened the long bell cord without causing it to ring and, bearing it, he dropped again to the floor. bindings with full strength, and smiled. Those would hold, let Andrias struggle as he would. The guard he stripped of clothing, bound and gagged with his own belt and spaceman's kerchief. He dragged him around behind the desk, thrust him under it out of sight. Andrias' chair he turned so that the unconscious face was averted from the door. Should anyone look in, then, the fact of Andrias' unconsciousness might not be noticed.

<question>:
Why is course change dangerous?

<options>:
A Because if one not strapped down, they are at the mercy of zero gravity and high speeds.
B Because even though the ship retains it's gravity, it moves at high speeds in which one can have a deadly fall or crash.
C Because if one is not in the pressure bunks, they can go unconscious, get extremely ill, or even die from the extreme pressure.
D Because due to the intense power that change course requires, the lights in the ship go out and if one isn't strapped down they might accidentally fall or crash.

<answer>:

A