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

<passage>:
Every writer must seek his own Flowery Kingdom in imagination's wide demesne, and if that search can begin and end on Earth his problem has been greatly simplified. In post-war Japan Walt Sheldon has found not only serenity, but complete freedom to write undisturbed about the things he treasures most. A one-time Air Force officer, he has turned to fantasy in It is not difficult to understand why. houlihan's equation by ... Walt Sheldon spot all sorts of minute shortcomings was a great help. And I was I must admit that at first I wasn't sure I was hearing those hearing the old tongue and talking of the old things every day, and circumstances, in or out of gravity, and under all conditions of friction and combustion." "Thank you, Mr. Houlihan," said coefficient of discharge for the matter in combustion. You may call it gas, if you wish, for we treated it like gas at the center for convenience—as tubes in our engine. Without this coefficient to give leprechauns. If we ever meet again, upon another world perchance, I see I shall have to explain this, although I had hoped to get right and so keep my part of the bargain." said. Keech's eyebrows popped upward. "What's this now?" "I don't feel it would be right to take it for a service of this root of the pressure-head driving it. But when you actually put things and in some awe, too, "well, now, At the terrible discharge speed of nuclear explosion—which is what the drive amounts to despite the fact that it is simply water in musha Lord help us! 'Tis the first which nuclear salts have been previously a bit smaller. from a mortal." He turned to his now, do you hear, for Mr. Houlihan—friend edge, the velocity of approach to the point of discharge, atomic weight and structure— Oh, there is so much of this that if you're not a to weary you. Perhaps you had better take my word for it that without this equation—correctly stated, mind you—mankind slowly and chuckled to myself at how I had gotten the best of the And all this talk of coefficients and equations sits strangely, you might had given them the wrong equation, of course. They would never get say, upon the tongue of a man named Kevin Francis Houlihan. center. Anyway, I heard these little But I am, after all, a scientist. If I like small working sounds, blending in eerily mysterious fashion with a chorus of small voices. I thought at had not been a specialist in my field determined the true coefficient of It would go down in scientific literature now, I suppose, as Houlihan's Equation, and that was honor There was a leader, an older one with a crank face. He was beating the air with his arms and piping: "Over here, now! All right, bring those electrical connections over here—and see you're not slow as treacle about it!" work greatly to my advantage, and also to the advantage of humankind, and when a man can do the first and never seen them so busy, either. They were building something in and shiny and upright and a little over five feet in height. "Come along now, people!" said this crotchety one, looking straight work! You'll not be needin' to then? Transcriber's Note: This etext was produced from Fantastic Universe mind that man standin' there! You know he can't see nor hear us!" Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed. Minor spelling and and became stiff and alert for a moment, as though suspecting that perhaps Oh, it was good to hear the rich I said, "Just a minute, friend, and I'll beg your pardon. It so happens I can see you." deeming such a thing impossible. staring open-mouthed. Then he said, "What? What's that, now?" I knew what it was they feared. "I don't intend catching one of you!" I said. "Come back, you daft little creatures!" But I was after no gold. I only wanted to hear the music of an Irish job of work for almost shamefully generous pay. You see, in a place as full of science as the nuclear propulsion "Listen to me now, little people!" I called out. "My name's Houlihan of the Roscommon Houlihans. I am descended from King Niall himself—or so at least my father used to say! Come on out now, and pass the time o' day!" Then I waited, but they didn't knotty problem, and I was up against a blank wall. Simply because become clogged. I knew that if I could just once hear the old tongue again, and talk a resounding blow with my fist. "Hear me now, little people! If you don't show yourselves and come out and talk to me, I'll wreck this spaceship from stem to stern!" I heard only the leaves rustling softly. "Do you understand? I'll give you until I count three to make an proportional to the square The glade remained deathly silent. "Two!" appearance! One!" " Three! " The working model and the fact And with that the little people together, contractions or expansions in a friendly gesture of greeting. "Good morning," I said. "Good morning," the foreman said with some caution. "My name is Keech." "And mine's Houlihan, as I've told you. Are you convinced now that I have no intention of doing talk." I nodded as I spoke, and sat down cross-legged upon the grass. "Any Irishman wants to talk, Mr. Houlihan." "And often that's all Keech stared back without much expression, and said, "I've been wondering how you guessed it was must confess that does astonish me." "And why wouldn't I know a said. "Oh, there's no need for apology," said Keech. "Though in truth we prefer poets to scientists. But it beginning," he replied. "But continue." "We had to come here," said Keech, "to learn how to make a spaceship." "A spaceship, now," I said, unconsciously adopting some of the old manner. "Leprechauns are not really mechanically and laughter and mischief, as anyone knows." "Myself included," I agreed. "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." I scratched my cheek. "How such as that?" "It's very simple. With all the up in the process of destroying yourselves." "There is 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—" constellation Orion, which sounds as though it has a good Irish name, but I was hooted down. Be that as it may, my own job was to go into your nuclear center, learn how to make the ship, and proceed with its 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. There's one thing which puzzles me, though. If you've been constantly around us—and I'm still "Truly we are, Mr. Houlihan. Now—to business. Just during has crossed my mind. That's why I'm wastin' all this time with you, sir. You say you are a scientist." "A nuclear engineer." "Well, then, it may be that you can help us—now that you know "The power control, Mr. Houlihan. As I understand it, 'tis necessary to know at any instant exactly how much thrust is bein' delivered out exactly as it does on paper." "You're referring to the necessity for a coefficient of discharge." "Whatever it might be named," said Keech, shrugging. "'Tis the not with humor, "the avarice of humans! I knew it! Well, Mr. Houlihan, I'll give you reason enough. That's a grandmother's tale.

<question>:
What is the narrator's ethnicity?

<options>:
A Irish
B American
C Leprechaun
D Japanese

<answer>:

A