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

<passage>:
Letter from M. Mitchell Waldrop Paul Krugman replies to M. Mitchell Waldrop --M. Mitchell Waldrop Washington How did this fantasy come to be so widely believed? I am glad to hear that you tried to tell a more balanced story, Mr. Waldrop, even if sloppy paperwork kept it from seeing the light of day. And I am glad that you talked to Ken Arrow. But Nobel laureates, who have wide responsibilities and much on their mind, are not necessarily on top of what has been going on in research outside their usual field. I happen to know of one laureate who, circa 1991, was quite unaware that anyone had thought about increasing returns in either growth or trade. Did you try talking to anyone else--say, to one of the economists who are the straight men in the stories you tell? For example, your book starts with the story of Arthur's meeting in 1987 with Al Fishlow at Berkeley, in which Fishlow supposedly said, "We know that increasing returns can't exist"--and Arthur went away in despair over the unwillingness of economists to think the unthinkable. Did you call Fishlow to ask whether he said it, and what he meant? Since by 1987 Paul Romer's 1986 papers on increasing returns and growth had started an avalanche of derivative work, he was certainly joking--what he probably meant was "Oh no, not you too." And let me say that I simply cannot believe that you could have talked about increasing returns with any significant number of economists outside Santa Fe without Romer's name popping up in the first 30 seconds of every conversation--unless you were very selective about whom you talked to. And oh, by the way, there are such things as libraries, where you can browse actual economics journals and see what they contain. 1) Krugman claims that my opening sentence--"In a way, Bill Gates's current troubles with the Justice Department grew out of an economics seminar that took place thirteen years ago, at Harvard's John F. Kennedy School of Government"--is "pure fiction." Perhaps so, but in that case somebody should tell this to Joel Klein, the assistant attorney general in charge of the antitrust division. When I interviewed Klein for my piece about the Microsoft case, he singled out Brian Arthur as the economist who has most influenced his thinking about the way in which high-technology markets operate. It was Klein's words, not those of Arthur, that prompted me to use Arthur in the lead of the story. Even more to the point: How did Cassidy come by his story? Is it possible that he completely misunderstood what Brian Arthur was saying--that the whole business about the seminar at Harvard where nobody would accept increasing returns, about the lonely struggle of Arthur in the face of ideological rigidity, even the quotation from Arthur about economists being unwilling to consider the possibility of imperfect markets because of the Cold War (give me a break!) were all in Cassidy's imagination? Let me say that I am actually quite grateful to Cassidy and The New Yorker . A number of people have long been furious about your book--for example, Victor Norman, whom you portrayed as the first of many economists too dumb or perhaps narrow-minded to understand Arthur's brilliant innovation. Norman e-mailed me to say that "I have read the tales from the Vienna woods before and had hoped that it could be cleared up by someone at some point." Yet up to now there was nothing anyone could do about the situation. The trouble was that while "heroic rebel defies orthodoxy" is a story so good that nobody even tries to check it out, "guy makes minor contribution to well-established field, proclaims himself its founder" is so boring as to be unpublishable. (David Warsh's 1994 series of columns in the Boston Globe on the increasing-returns revolution in economics, the basis for a forthcoming book from Harvard University Press, is far and away the best reporting on the subject, did include a sympathetic but devastating exposÃ© of Arthur's pretensions--but to little effect. [Click to read Warsh on Arthur.]) Only now did I have a publishable story: "guy makes minor contribution to well-established field, portrays himself as heroic rebel--and The New Yorker believes him." 6) I might attach more weight to Krugman's criticisms if I hadn't recently reread his informative 1994 book Peddling Prosperity , in which he devotes a chapter to the rediscovery of increasing returns by contemporary economists. Who are the first scholars Krugman mentions in his account? Paul David, an economic historian who wrote a famous paper about how the QWERTYUIOP typewriter keyboard evolved and, you guessed it, Brian Arthur. "Why QWERTYUIOP?" Krugman wrote. "In the early 1980s, Paul David and his Stanford colleague Brian Arthur asked that question, and quickly realized that it led them into surprisingly deep waters. ... What Paul David, Brian Arthur, and a growing number of other economists began to realize in the late seventies and early eighties was that stories like that of the typewriter keyboard are, in fact, pervasive in the economy." Evidently, Krugman felt four years ago that Arthur's contribution was important enough to merit a prominent mention in his book. Now, he dismisses the same work, saying it "didn't tell me anything that I didn't already know." Doubtless, this change in attitude on Krugman's part is unconnected to the fact that Arthur has started to receive some public recognition. The eminent MIT professor, whose early academic work received widespread media attention, is far too generous a scholar to succumb to such pettiness. Letter from M. Mitchell Waldrop: After reading Paul Krugman vent his spleen against fellow economist Brian Arthur in "The Legend of Arthur," I couldn't help wondering whose reputation he was out to trash, Arthur's or his own. Krugman seems to fear a plot to deny economists their intellectual due. If one exists, Arthur is not a likely suspect. In a series of long interviews with me a year ago (for Worth magazine), I tried, vainly, to get Arthur to tell me how his ideas about increasing returns have encouraged a new strain of economic investigations. Despite much prodding, Arthur obliged only by placing himself in a long line of theorists dating back to Adam Smith and Alfred Marshall. I also found him disarmingly generous in giving credit to the biologists, physicists, and fellow economists who have helped advance his own thinking. Savvy to the journalist's quest for heroes, Arthur urged me to focus on his ideas, not his rank among his peers. Krugman has made a career out of telling other economists to pay better attention to the facts, yet as a chronicler of Arthur's career and inner life, Krugman seems to have listened only to his own demons. a) During our interviews, Brian went out of his way to impress upon me that many other economists had done work in increasing returns--Paul Krugman among them. He was anxious that they be given due credit in anything I wrote. So was I. c) So, when I received Krugman's letter shortly after Complexity came out, I was puzzled: He was complaining that I hadn't referenced others in the increasing-returns field--Paul Krugman among them--although I had explicitly done so. d) But, when I checked the published text, I was chagrined to discover that the critical passage mentioning Krugman wasn't there.

<question>:
Why didn’t M. Mitchell Waldrop give credit to other economists in his book?

<options>:
A He didn’t know about them.
B He left them out of the book deliberately.
C He wrote about them but it was cut during the editing process.
D This is untrue; the book includes this information.

<answer>:

C