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

<passage>:
JAYWALKER window at the ordered streets of the great Luna Dome. "The Moon.... Jack, you did it!" 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 side of the space-field barriers. Even that possibility was denied her that way I found out that when you walked up that gangway, you did the it?" He hugged her. After a time he reached down and touched her swelling waist. It was like a benediction. "He'll be born on the Moon," he whispered, "and he'll have eyes the color of all Earth when it looks out to the stars." " She'll be born on the Moon," corrected Marcia, "and her name will be Sue, and ... and she'll be almost as good as her father." the field, to the laboring beetle of a red tractor bearing the gangway dark-eyed and scrappy, might come swinging down the long, shining easy to come aboard on someone else's validation, and people don't seem to realize how dangerous that is." silly ! It's been nineteen whole years since your father died in the explosion of a Moon-rocket. Rocket motors just don't explode any more, honey! Ships travel to the Moon and back on iron-clad, mathematical orbits that are figured before the ship puffs a jet—" "The 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 Jaywalker !" Jack spat in disgust. "Anyway, he was the kind of idiot who never realizes that certain glandular conditions are fatal in free fall." Even now she distinctly recalled the beginnings of the interplanetary 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 trajectory, and had to warp her in as best he could, without passing the Moon or crashing into it. And of course you're not listening." "It's all so dull!" she had flared, and then, "How can I be interested in what some blundering space-jockey did?" After he'd gone—for good, he said—her anger had sustained her for a few weeks. Then, bleakly, she knew she'd go to the ends of Earth for Jack. Or even to the Moon.... Sitting rigid in the tense stillness of a rocket ship that was about quiet brown eyes solemn. "What you are about to experience is something It looked the way she felt—flat and pale and devoid of life, with a time. "How do you feel?" "Why, what—is there to be scared of?" "I'm pregnant." "Well, that's no—You're what ?" know." "You face wooden. "Just find it out?" ship?" ?" no matter how he felt about them before." . Well, he's it." "Come up with a crescent wrench, will you, Pet?" asked it. "Do you work on all these ships at one time or another?" "Jaywalker?" "Please hurry, Pet." She turned to Marcia. "I've got to explain to the passengers that there won't be any free fall. Most of them are looking "About you and the captain." to keep them to myself." "Very courteous, I'm sure. However, I want to release you from your sense of duty. I'm most Miss Eagen gazed at her for a moment, nodded as if to herself, and said, "I suppose there always will be people who don't pay attention 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 looked Marcia straight in the eye. "What makes a jaywalker isn't ignorance. It's a combination of stupidity and stubbornness. The jaywalker does know better. In your case...." 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 unprecedented situation in free fall. Biologically it has experienced the condition for very short periods—falling out of trees, or on delayed parachute jumps. But it isn't constituted to take hour after "What about floating in a pool for hours?" asked Marcia sullenly. "That's quite a different situation. 'Down' exists when you're swimming. Free-fall means that everything around you is 'up.' The the—well, it varies in individuals. But it's pretty well trouble—sometimes. It kills women in menopause—often. It kills women in the early stages of pregnancy— always ." 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 "And the only thing that can be done about it is to supply gravity?" "Or centrifugal force (or centripetal, depending on where you're standing, but why be technical?)—or, better yet, keep those people off the ships." computer—working out orbital and positional and blast-intensity data that would be a hard nut for the giant calculators on Earth to crack. And he's doing it in half the time—or less—than it would take the average mathematician, because he has to because it's a life-and-death matter if he makes a mistake or takes too long." "But—but—" the same way he does when it isn't?" 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—" position and away again, the firing formulas get—well, complex. And 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. He'll come up on the Moon obliquely, pass it, stop the spin, turn over once to check the speed of the ship, and once again to put the tail down when the Moon's gravity begins to draw us in. There'll be two short periods of free-fall there, but they won't be long enough to bother you much. And if we can do all that with the fuel we've got, it "Where are you going?" these people...." machine, like a harried bookkeeper on the last day of the month. " All Earth watches me when I work, but with your eyes. " . He's risking his life for a—a stranger. A jaywalker. Not for me. Not even for his baby." drowsiness and unreality. But through and through that drugged, relaxed period, Jack and the stars, the Moon and Sue Eagen danced and wove. Words slipped in and out of it like shreds of melody: fighting—for his ship, for the Moon, for the new-building traditions gunmetal-and-chrome of the ship. White sheets, a new feeling of "down"

<question>:
What does "jaywalker" refer to in this story?

<options>:
A A person who does an illegal spacewalk
B A person who illegally gains passage into space
C A person who crosses the street illegally
D A person who illegally lives on the moon

<answer>:

B