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 had meant so much to him when he was tied to his wheelchair and going to Michigan to find Charlie. It was only natural, of course, because kids—normal kids—forget their pain quickly. It's a sort of defense mechanism, Doc says, against the disappointments of this life. job in Tampa where Joey could walk to school instead of going by bus. "Anything wrong, Joey?" I asked. Doc says that footloose migratories like him and me forget old associations as quick as kids do—and for the same good reason—so I'm I gave it up and went on to my own trailer without asking any more fool questions. How can you talk to a kid like that? Doc Shull wasn't in, but for once I didn't worry about him. I was trying to remember just what it was about my stumbling over Joey's it had happened before, about six weeks back when Doc and I first accents every day. "Let the boy alone." She was right about it being none of my business. I went on into the trailer I shared with Doc Shull and left the two of them waiting for Charlie together. back. But I was wrong on at least one count, because when I switched on the light and dumped the packages I'd brought on the sink cabinet I saw Doc asleep in his bunk. He'd had a drink, though. I could smell it on him when I shook him awake, and it smelled like gin. Doc sat up and blinked against the light, a thin, elderly little man with bright blue eyes, a clipped brown mustache and scanty brown hair tousled and wild from sleep. He was stripped to his shorts against the Doc got up and stepped into his pants. He padded barefoot across the linoleum and poked at the packages on the sink cabinet. bathroom this afternoon while his mother was away at work, and my selflessness had its just reward." Sometimes it's hard to tell when Doc is kidding. He's an educated man—used to teach at some Northern college, he said once, and I never doubted it—and talks like one when he wants to. But Doc's no bum, though he's a semi-alcoholic and lets me support him like an invalid uncle, and he's keen enough to read my mind like a racing form. shaved and pressed a shirt instead so he'd look decent enough to rate a shot of gin she'd offer him as a reward. It wasn't such a doubtful gamble at that, because Doc has a way with him when he bothers to use it maybe that's why he bums around with me after the commercial Doc put the snapper steaks to cook. He told me more about our neighbors while we killed the beer. The Ponds were permanent residents. The kid—his name was Joey and he was ten—was a polio case who hadn't walked for over a year, and his Joey was hospitalized with polio." "Tough," I said, thinking of the kid sitting out there all day in his wheelchair, straining his eyes across the palmetto flats. "You mean Doc nodded, seemed to lose interest in the Ponds, so I let the subject drop. We sat around after supper and polished off the rest of the only worked a day or so a week and spent the rest of the time lying around the trailer playing cribbage and drinking beer with Doc Shull. Usually it was the life of Riley, but somehow it wasn't enough in this the kid didn't want another mutt because he had what Doc called a psychological block. had depended on Joey for the affection he wouldn't take from anybody natural. At first I thought it was funny that Joey never complained or cried when Charlie didn't come home, but Doc explained that it was all a part of this psychological block business. If Joey cried he'd be admitting that Charlie was lost. So he waited and watched, secure in his belief that Charlie would return. The Ponds got used to Doc and me being around, but they never got what come around to swap sanitary tanks under the trailers and Joey would happened Doc and I could hear Ethel talking to him, low and steady, until all hours of the morning, and when he finally went back to sleep that changed Joey's routine and a lot more with it. It left a mark Doc and I looked at each other in the half-dark of our own trailer. "She's done it, Roy," Doc said. I knew what he meant and wished I didn't. Ethel had finally told the kid that Charlie wasn't coming back, not ever. That's why I was worried about Joey when I came home the next evening I was on my third beer when Doc Shull rolled in with a big package under his arm. Doc was stone sober, which surprised me, and he was hot and tired from a shopping trip to Tampa, which surprised me more. It story. Joey still didn't know that Charlie was dead, but his waiting Charlie by. It was about nine o'clock, when Ethel went home to cook supper. Doc much attention, but Doc nearly choked on his beer. "Roy," he said, "that was Sirius! I sat up and took notice then, partly because the star really had stopped instead of burning out the way a falling star seems to do, partly because anything that excites Doc Shull that much is something to think about. beer ?" I asked. Doc laughed at that, sounding more like his old self. "No, Roy. No two people ever had instantaneous and identical hallucinations." suggested to Doc, only half joking, that maybe the Pup had stayed put because it wasn't bright enough to suit Joey's taste, but Doc called "Don't joke about Joey," he said sternly. "Getting back to to reach us. That means it started moving when Joey was only eighteen I pointed out. "I'm not saying that Joey really moved those damn I trailed along, but we didn't get farther than Joey's wheelchair. I left Doc shaking his head at the sky and went over to give Joey, who Doc couldn't hear, then I asked him how things were going. "Slow, Roy," he said. "I've got 'most a hundred to go, yet." He gave me a very small smile. "You'll know when I'm through," he said. I told Doc about that after we'd bunked in, but he said I should not taken for granted as being facts all his life, like those astronomers who were going nuts in droves all over the world. I didn't realize how upset Doc really was, though, till he woke me up at about 4:00 a.m. ." That from Doc was something I'd never expected to hear. It startled me wide enough awake to sit up in the dark and listen while he unloaded his worries. again? I've always heard that if a man had faith enough he could move Doc got up and went back to his own bunk. "Maybe you're right. We'll find out tomorrow." And we did. Doc did, rather, while I was hard at work hauling red Doc had given him to study. The thing that stopped me was that Joey "Roy," he said, without taking his eyes off his toes, "did you know that Doc is an awfully wise man?" I said I'd always thought so, but why? For a minute I was mad enough to brain Doc Shull if he'd been handy. Anybody that would pull a gag like that on a crippled, helpless kid.... "Doc says that if I can do what I've been doing to the stars then it ought to be easy to move my own feet," Joey said. "And he's right, didn't really turn out either way. It ended in what Doc Shull called an anticlimax, leaving everybody happy enough except a few astronomers finished because Joey Pond lost interest in it when he learned to walk Walking was a slow business with Joey at first because his legs had got thin and weak—partially atrophied muscles, Doc said—and it took time to make them round and strong again. But in a couple of weeks he was stumping around on crutches and after that he never went near his

<question>:
How was Joey able to regain his ability to walk?

<options>:
A His mother got a better job and could afford treatment
B He used his mind so that he could search for Charlie
C He outgrew his congenital issues
D Doc was able to cure his polio

<answer>:

B