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

<passage>:
that was unlike either Earth or the ship, a novel and exhilarating buoyancy. And kneeling by the bed— "Jack!" "You're all right, honey." spaceship—and nothing could ever stop her now. Not unless she broke down completely in front of all these hurrying, Moon-bound passengers, in plain sight of the scattered crowd which clustered on the other the way.... Somehow, dizzily, she was at her seat, led there by a smiling, brown-clad stewardess and her azure-tipped fingers were clutching at house—the comfort, the safety, the—the sanity aisle. Jack—Captain Jack McHenry, if you please—must not know, yet, read: CAUTION HAVE YOU PASSED YOUR PHYSICAL EXAMINATION? Avoiding It May Cost Your Life! "May I see your validation, please?" "You're feeling well, Mrs. Foster?" Feeling well? Yes, of course. Except for the—usual sickness. But Miss Eagen (which, her neat lapel button attested, was her name) made a penciled frown as lovely as her machined smile. "Some day," she told Marcia, "we won't have to ask the passengers if they're well. It's so easy to come aboard on someone else's validation, and people don't seem to realize how dangerous that is." had to be all right.... After this—if this didn't work—there just would be nothing else she register for the trip and take the physical for her. She'd had to lie Everyone knew about the Elsinore , the 500-foot Moon-ferry that almost missed the Moon. "That," he said bitterly, "was human damnfoolishness botching up the equations. Too many lobbyists have holdings on the Moon and don't want to risk not being able to go there in a hurry. So they haven't passed legislation to keep physically unfit people off spaceships. One of the passengers got aboard the Elsinore on somebody else's validation—which meant that nobody knew he was taking endocrine who never realizes that certain glandular conditions are fatal in free reached the free-fall flight, where power could be shut off, the skipper had to put the ferry into an axial spin under power, creating artificial gravity to save the worthless life of that fool. So of course he lost his the passenger compartment from the pilot room's deep glow. But it seats. He ducked back out of sight. From the bulk-heads, the overhead, everywhere, came a deep, quiet rumble. Some of the passengers looked anxious, some excited, and some just leafed casually through magazines. Now the brown-clad Miss Eagen was speaking from the head of the aisle. "Those of you who haven't been in a rocket before won't find it much different from being in an airplane. At the same time—" She paused, had grown around the ship, Earth was a mystic circle, a shallow dish floating darkly and heavily below. "We are now," said Miss Eagen's calm voice, "thirty-seven miles over pressed herself up out of the soft chair—it was difficult, because of the one-and-a-half gravities the ship was holding—and plodded heavily up the aisle. Miss Eagen was just rising from the chair in which she sat for the take-off. "Yes, Mrs. Fos—why, what's the matter?" Seeing the startled expression on the stewardess' face, Marcia realized "Come along," said Miss Eagen cheerfully. She put a firm arm around Marcia's shoulder. "Just a touch of space-sickness. This way. That's positive voice. She let herself be led forward, through the door and to the left, where there was a small and compact ship's hospital. "Now, now," said Miss Eagen briskly, "just you lie down there, Mrs. time. "How do you feel?" "I'm pregnant." Captain." "McHenry here." "Captain McHenry, could you come back to the hospital right away?" "Not right away, Sue." Sue! No wonder he had found it so easy to walk here , on my ship!" a kindergarten child who knows she has the right answer. The stewardess looked at her, her face registering a strange mixture of back again. Instead she dialed and said, "Hospital to Maintenance. the finest in the Service." "He—th-thinks as well of you, no doubt." passengers that there won't be any free fall. Most of them are looking "And why not?" "Because," said Miss Eagen, and in that moment she looked almost as drawn as Jack had, "I'm supposed to be of service to the passengers at all times no matter what. If I have feelings at all, part of my job is to keep them to myself." "Very courteous, I'm sure. However, I want to release you from your sense of duty. I'm to the rules. Jaywalkers. But out here jaywalkers don't have as much margin for error as they do crossing against a traffic light on Earth." She sighed. "It's well known—even by you—that the free-fall condition has a weird effect on certain people. The human body is in an body's reactions to free-fall go much deeper than space-nausea and a mild feeling of panic. When there's a glandular imbalance of certain of the mind reacts as if there were a violent emergency, when no emergency is recognized by the reasoning part of the mind. There are sudden floods of adrenalin in the early stages of pregnancy— always ." "Convulsions. A battle royal between a glandular-level panic and a violent and useless effort of the will to control the situation. Muscles tear, working against one another. Lungs rupture and air is forced into the blood-stream, causing embolism and death. Not everything is known about it, but I would guess that pregnant women are especially susceptible because their protective reflexes, through and through, are much more easily stimulated." standing, but why be technical?)—or, better yet, keep those people off the ships." matter if he makes a mistake or takes too long." "But—but—" "But what?" Miss Eagen's composure seemed to have been blasted to "You mean, but why doesn't he just work the ship while it's spinning "He'll spin the ship on its long axis," said the stewardess with bursts, timed to the hundredth of a second, to be able to make even a slight course correction. The sighting instruments are wheeling round and round while you're checking your position. Your fuel has to be calculated to the last ounce—because enough fuel for a Moon flight, with hours of fuelless free-fall, and enough fuel for a power spin and course corrections while spinning, are two very different things. Captain McHenry won't be able to maneuver to a landing on the Moon. He'll do it exactly right the first time, or not at all." Marcia was white and still. "I—I never—" the ship's course and landing approach are completely new. Instead of letting the ship fall to the Moon, turning over and approaching tail-first with the main jets as brakes, Captain McHenry is going to have to start the spin first and go almost the whole way nose-first. once to check the speed of the ship, and once again to put the tail Miss Eagen was beside her in an instant, a hard small hand on her arm. "Where are you going?" "I'm going to stop him. He can't take that chance with his ship, with She found herself at the entrance to the pilot room. In one sweeping "... human damnfoolishness botching up the equations...." He had said "He's started the spin. You'll be all right now." gunmetal-and-chrome of the ship. White sheets, a new feeling of "down"

<question>:
Why do the flight attendants check if the passengers are feeling well?

<options>:
A Those with certain maladies are unable to travel in space without dying
B Feeling ill is an indication of not being emotionally prepared to go into space
C They need to be extra cautious not to transfer viruses from Earth to the Moon
D The passengers have duties to ensure the safe travel of everyone on board, so they must be in top condition

<answer>:

A