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

<passage>:
the entire problem all but whipped. It is not difficult to understand why. houlihan's equation that the small people with their quick eyes and clever fingers could The working model and the fact I must again. I had known precisely such "Here is your equation," I said. "It That morning I had been trying to work out an equation to give the "you will not be forgotten by the leprechauns. If we ever meet again, upon another world perchance, you'll find our friendship always workable equation when we set Without this coefficient to give I see I shall have to explain this, although I had hoped to get right "I'll not be needing the gold," I "What's this now?" "I'll not be needing it," I repeated. "I don't feel it would be right to take it for a service of this sort." "Well," said Keech in surprise, and in some awe, too, "well, now, musha Lord help us! 'Tis the first of nuclear explosion—which is what the drive amounts to despite the fact that it is simply water in which nuclear salts have been previously from a mortal." He turned to his time I ever heard such a speech and structure— Oh, there is so much of this that if you're not a nuclear engineer yourself it's certain 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 to make a first trip to the moon. And all this talk of coefficients and how I had gotten the best of the slowly and chuckled to myself at named Kevin Francis Houlihan. had given them the wrong equation, But I am, after all, a scientist. If I had not been a specialist in my field later, if they tried to spy out the I would hardly have found myself of course. They would never get their spaceship to work now, and in eerily mysterious fashion with a of the trees, not wanting to deprive done so quickly without those sessions his working model. It would go down in scientific literature now, I suppose, as Houlihan's Equation, and that was honor 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 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 For if I had shown the little people how to make a spaceship they would have left our world. And "Come along now, people!" said this crotchety one, looking straight for us to believe in every now and then? Transcriber's Note: 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 know he can't see nor hear us!" typographical errors have been corrected without note. deeming such a thing impossible. said, "What? What's that, now?" "Ohhh!" he said and put his palms to his cheekbones. "Saints be with us! He's a believer! Run everybody—run for your lives!" And they all began running, in They continued to scurry. I knew what it was they feared. you!" I said. "Come back, you daft But the glade was silent, and they had all disappeared. They thought I wanted their crock of gold, of course. I'd be entitled to it if I could catch one and keep him. Or so the legends affirmed, though I've wondered even if I had latched on to a fine job of work for almost shamefully generous pay. You see, in a place as full of science as the nuclear propulsion almost miraculously complete Houlihan of the Roscommon Houlihans. I am descended from King Niall himself—or so at least my father used to say! Come on out Then I waited, but they didn't answer. The little people always a decision in so many words I knew satisfactory conclusion. I heard only the leaves rustling The glade remained deathly silent. "Two!" as if a small, brittle twig had suddenly appeared. The leader—he seemed more drawing a kind of peppered dignity up about himself, "in such matters I am never fully convinced. After living for many centuries I am all too acutely aware of the perversity of human nature." "Yes," I said. "Well, as you will quickly see, all I want to do is all he wants," wondering how you guessed it was "And why wouldn't I know a "It just so happens I'm a doctor of science." "A doctor of science, now," said Keech. "Invited by the American government "I'll make no apologies for it," I "Oh, there's no need for apology," said Keech. "Though in truth we prefer poets to scientists. But it has just now crossed my mind, Mr. Houlihan that you, being a scientist, might be of help to us." "How?" I asked. "But continue." "We had to come here," said Keech, "to learn how to make a adopting some of the old manner. "Leprechauns are not really mechanically inclined," said Keech. "Their major passions are music and laughter and mischief, as anyone knows." "Myself included," I agreed. "Then why do you need a spaceship?" "Well, if I may use an old expression, we've had a feelin' lately that we're not long for this world. Or let me put it this way. We feel the world isn't long for itself." would a man unravel a statement "It's very simple. With all the super weapons you mortals have developed, there's the distinct possibility "Well, then, as I say," said Keech, "the little people have decided to leave the planet in a spaceship. Which we're buildin' here and now. We've spied upon you and how to do it. We haven't learned yet how to control the power—" I was inclined to suggest the construction. Naturally, we didn't understand all of your high-flyin' science, but some of our people are pretty clever at gettin' up replicas of things." thought it was by the Russians. path. It may be you can only see us when you're thinkin' of us, and of course truly believin' in us. I don't know—'tis a thing of the mind, and not important at the moment. has crossed my mind. That's why I'm wastin' all this time with you, sir. You say you are a scientist." "Help you?" to know at any instant exactly out exactly as it does on paper." "You're referring to the necessity "Whatever it might be named," said Keech, shrugging. "'Tis the one thing we lack. I suppose eventually "And you want me to help you 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!" "The one at the end of the rainbow?" That's a grandmother's tale. Nor is it actually in an earthen crock. But there's gold, all right, enough to make you rich for the the aid of diagrams, as engineers I came back again the next day—and but Keech and his people made a canopy of boughs and leaves and I was comfortable enough. Every once or the center itself would pass by, and stop to watch me. But of course they wouldn't see the leprechauns or anything the leprechauns had made, not being believers. I would halt work, pass the time of day, and then, in subtle fashion,

<question>:
Why didn't the narrator provide the leprechauns with the correct equation?

<options>:
A He knows that the leprechauns are preventing humans from destroying the Earth
B He wants to take credit for the equation and is concerned they will try to get credit first
C In swearing their allegiance to him, they are bound to him for eternity
D He believes humans need to believe in things like leprechauns in order to sustain their own race

<answer>:

D