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

<passage>:
By D. ALLEN MORRISSEY Science equipped David Corbin with borrowed time centuries ... to a dark blue world whose only defense was to seal tight the prying minds of foolish interlopers. "Your name is David Corbin. Do you understand?" "Your name is David Corbin." in patient attention, trying to outguess the voice. I recalled a phrase ... some words about precaution. Precaution against forgetting. Control of a ship? Going where? the pain in my hands made me stop. "I can't remember what to do." I held my bruised hands to my mouth, and I knew that was all the thought of time again. I was supposed to act according to ... plan. Did that mean ... in time ... in time. I went back down the passageway. The fourth small room was the same. Except for the woman. She lay on a to accept. Her beauty was graceful lines of face and her figure—smooth tapering legs, soft curves that were carved out of flesh colored stone. Yet not stone. I held her small hand, then put it back on the cot. Her at a deep blue eye that stared back in glassy surprise. Four people in all, depending on a blind helpless fool who didn't know their names or the reason for that dependence. I sat beside her on the cot until I could stand it no longer. Searching the ship made me forget my fear. I hoped I would find some for me. I wondered if I was an engineer or a pilot, or perhaps a doctor sent along to safeguard the others. Complete amnesia would have been terrible enough but this half knowledge, part awareness and association with the ship was a frightening force that seemed ready to break out of I went back to the cabin where the powerful man lay. I had to risk failure with one of them. I didn't want it to be the girl. I fought down the thought that he might be the key man, remembering the voice that had given the message. It was up to me, and soon. The metal in the "You get used to it fast," I answered. I thought of what to say as he watched me. "How do you feel?" He shrugged at the question. "Fine, I guess. Funny, I can't remember." He saw it in my face, making him stop. "I can't remember dropping off to sleep," he finished. I held his hard arm. "What else? How much do you remember?" "I'm all right," he answered. "There aren't supposed to be any effects from this." "Who is in charge of this ship?" I asked. I moved away from the cot. "Listen, I can't remember. I don't know your name or anything about this ship." "What do you mean? What can't you remember?" he asked. He stood up slowly, edging around towards the door. I didn't want to fight him. I wanted him to understand. "Look, I'm in trouble. Nothing fits, except my name." "The others. What about the others?" he blurted. "I don't know. You're the first besides myself. I don't know how I stumbled on the way to revive you." "Yes. I've got to know if they are like me. I'm afraid to think they might be." "Maybe it's temporary. We can figure something out." II quarters. "What about her. Why is she here?" I asked my companion. He lifted the cover from the apparatus. "She's the chemist in the crew." girl." "I don't know why, Captain. You tried to stop her before. Age and experience were all that mattered to the brass." "It's a bad thing to do." "I suppose. The mission stated one chemist." "What is the mission of this ship?" I asked. He held up his hand. "We'd better wait, sir. Everything was supposed to be all right on this end. First you, then Carl, sick to his stomach." "Okay. I'll hold the questions until we see about her." We questioned her and she was coherent but she couldn't remember. I tried to smile as I sat on the cot, wondering what she was thinking. "How do you feel?" I asked. Her face was a mask of wide-eyed fear as she shook her head. "Can you remember?" uncontrollably. "What's happened to me?" she asked. The dark haired man came into the room, silent and watchful. My face with her hands. I turned to the other man. "What's your name?" "Croft. John Croft." "I'm trying. I know the ship is familiar, but I've looked it over. Maybe I'm trying too hard." "I can't remember when," I said. I held the trembling girl against me, shaking my head. He glanced at the girl. "If the calculations are right it was more than a hundred years ago." We assembled in the control room for a council. We were all a little better for being together. John Croft named the others for me. I restless, with dark eyes that studied the rest of us. I looked at the girl. She was staring out of the ports, her hands pressed against the transparent break in the smooth wall. Karen Thiesen was a chemist, now frightened and trying to remember. I wasn't in much better condition. "Look, if it comes too fast for me, "I can't grasp it. How can we go very far in a lifetime?" "It can be done in two lifetimes," John said quietly. "How long ago was it?" "It was set at about a hundred years, sir. Doesn't that fit at all?" "I can't believe it's possible." Carl caught my eye. "Captain, we save this time without aging at all. It puts us near a calculated destination." "We've lost our lifetime." It was Karen. She had been crying silently while we talked. "Don't think about it," Paul said. "We can still pull this out all right if you don't lose your nerve." "What are we to do?" she asked. John answered for me. "First we've got to find out where we are. I know this ship but I can't fly it." "Can I?" I asked. We set up a temporary plan of action. Paul took Karen to the laboratory in an effort to help her remember her job. Carl went back to divide the rations. I was to study the charts and manuals. It was better than doing "I wish I knew what you were doing," I said savagely. "Give it time." "We can't spare any, can we?" I asked. "I wish we knew. What about her—Dr. Thiesen?" "She's in the lab. I don't think that will do much good. She's got to be shocked out of a mental state like that." "I guess you're right," he said slowly. "She's trained to administer the suspension on the return trip." I let my breath out slowly. "I didn't think about that." "We couldn't even get part way back in a lifetime," he said. "How old are you, John?" "Twenty-eight." "What about me?" "I know. It's the only thing I could think of. Why didn't everyone react the same?" "That had me wondering for a while. I don't know. Anyway how could you go about making her remember?" "Throw a crisis, some situation at her, I guess." He shrugged, letting his sure hands rest on the panel of dials. I around his massive shoulders. "You did it." "You gave me the idea, Mister, talking about Dr. Thiesen." you're all right." "John did it. He hit the alarm figuring I would react. Listen, Paul. Is any one hurt?" "No. Carl is here too. His stomach flopped again but he's okay. What about food. We're supposed to be checked before we eat." "We'll have to go ahead without it. Any change?" "No, I put her to bed. Shall I bring food?"

<question>:
Of his fellow crew members, who does David seem to have the most concern for and why?

<options>:
A Karen, because she's a female crew member and because she has a bad reaction to being awoken.
B John, because he relies on him to be his right-hand man.
C John, because David first wakes him up with the apparatus and is unsure how safe the apparatus is to operate.
D Karen, because she's his wife and he only remembers this with time.

<answer>:

A