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

<passage>:
send the intruder on his way. Keech and the little people just stood by the entire problem all but whipped. It is not difficult to understand why. houlihan's that the small people with their quick eyes and clever fingers could The working model and the fact spot all sorts of minute shortcomings was a great help. And I was equation by ... Walt Sheldon On the sixteenth day I covered a each other to hush, be quiet, and the soft breeze stirring them up again. I had known precisely such piece of paper with tiny mathematical symbols and handed it to Keech. "Thank you, Mr. Houlihan," said "Mr. Houlihan," said Keech, us control, we would have lacked a workable equation when we set about putting the first moon rocket "And now, Mr. Houlihan," said around those extraordinary engines "Well," said Keech in surprise, and in some awe, too, "well, now, musha Lord help us! 'Tis the first time I ever heard such a speech from a mortal." He turned to his what the drive amounts to despite now, do you hear, for Mr. Houlihan—friend which nuclear salts have been previously dissolved—this small factor of the little people as to weary you. Perhaps you had better take my word for it that without this equation—correctly stated, mind you—mankind would be well advised not And I lit my pipe and smoked it slowly and chuckled to myself at how I had gotten the best of the little people. Surely it was not every mortal who could accomplish that. I had given them the wrong equation, of course. They would never get their spaceship to work now, and had not been a specialist in my field I would hardly have found myself engaged in vital research at the But I am, after all, a scientist. If I measures to prevent it, for I had the advantage of being able to see them. first it might be children at play, but then at the time I was a bit absent-minded. I tiptoed to the edge of the trees, not wanting to deprive any small scalawags of their pleasure, determined the true coefficient of discharge, which I never could have I saw? Not children, but a group of little people, hard at work. There was a leader, an older one Equation, and that was honor and glory enough for me. I could with a crank face. He was beating There was no sense in cheating him out of the gold to boot, for leprechauns are most clever in matters of this sort and he would have had it back soon enough—or else made it a burden in some way. Indeed, I had done a piece of work greatly to my advantage, and also to the advantage of humankind, and when a man can do the first and include the second as a fortunate byproduct become convinced they could never For if I had shown the little people on my tenth birthday. And I had how to make a spaceship they would have left our world. And "Come along now, people!" said this crotchety one, looking straight work! You'll not be needin' to mind that man standin' there! You know he can't see nor hear us!" Oh, it was good to hear the rich old tongue again. I smiled, and the foreman of the leprechauns—if that's what he was—saw me smile and became stiff and alert for a moment, as though suspecting that perhaps I actually could see him. Then he shrugged and turned away, clearly deeming such a thing impossible. I said, "Just a minute, friend, little souls. They began to scurry little creatures!" But the glade was silent, and they had all disappeared. They thought I catch one and keep him. Or so the wanted to talk to the little people. and looked about the glade. I knew they were all hiding nearby, watching me apprehensively. I lifted my head to them. "Listen to me now, little people!" I called out. "My name's Houlihan of the Roscommon Houlihans. father used to say! Come on out now, and pass the time o' day!" Then I waited, but they didn't answer. The little people always had been shy. Yet without reaching a decision in so many words I knew had to talk to them. I was so lonely that my mind had become clogged. I knew that if I could just once hear the old tongue again, and talk about the old things, I might be able to think the problem through to a satisfactory conclusion. And with that the little people suddenly appeared. The leader—he seemed more wizened and bent than before—approached me slowly and warily as I stood there. The others all followed at a safe distance. I smiled to reassure "And mine's Houlihan, as I've "Mr. Houlihan," said Keech, too acutely aware of the perversity of human nature." "Yes," I said. "Well, as you will Houlihan." Houlihan. And afterward we'll appreciate "That's exactly what's got me curious." The others had edged in a bit now and were standing in a circle, group of little people be building a the little people. It happens every astonish me." "And why wouldn't I know a "A doctor of science, now," said Keech. "Invited by the American government to work on the first moon can advise you of it." "A scientist, is it," said Keech. has just now crossed my mind, Mr. Houlihan that you, being a scientist, might be of help to us." "How?" I asked. "Well, I might try starting at the beginning," he replied. "But continue." "We had to come here," said Keech, "to learn how to make a knows." "Myself included," I agreed. "Then why do you need a spaceship?" I scratched my cheek. "How would a man unravel a statement such as that?" "It's very simple. With all the super weapons you mortals have developed, there's the distinct possibility that possibility," I said. "Well, then, as I say," said Keech, "the little people have decided now. We've spied upon you and learned how to do it. Well—almost how to do it. We haven't learned yet how to control the power—" "Hold on, now," I said. "Leaving working on that. 'Tis not our concern. I was inclined to suggest the thought it was by the Russians. There's one thing which puzzles center. later, if they tried to spy out the "A nuclear engineer." "Well, then, it may be that you can help us—now that you know we're here." "Help you?" "The power control, Mr. Houlihan. As I understand it, 'tis necessary right information I would take special in eerily mysterious fashion with a to know at any instant exactly chorus of small voices. I thought at "Whatever it might be named," said Keech, shrugging. "'Tis the one thing we lack. I suppose eventually you people will be gettin' around to it. But meanwhile we "And you want me to help you with this?" "Well, now, Keech," I said finally, "why should I help you?" "Ha!" said Keech, grinning, but not with humor, "the avarice of humans! I knew it! Well, Mr. Houlihan, I'll give you reason enough. The pot o' gold, Mr. Houlihan!" us how to make our ship work." "Well, now, that's quite an offer," I said. Keech had the goodness his working model. It would go down in scientific about the whole project. It was a most fascinating session. I had often wished for a true working had been inserted in the budget for it. Keech brought me paper and pencil and I talked with the aid of diagrams, as engineers are wont to do. Although the pencils were small and I had to hold as you would a needle, I was able to make many sensible observations and even a few innovations. do without Keech's pot of gold, was comfortable enough. Every once in a while someone from the town of day, and then, in subtle fashion,

<question>:
Why of these is not a reason Houlihan agreed to help the little people?

<options>:
A He saw it as an opportunity to clear his head about his own work
B He figured their ship could act as a test case for his work
C He felt a kinship with them because of his family's history
D He figured he was the only one with knowledge to help them solve their problem

<answer>:

D