(A) Three hundred is too small a sample on which to base such a sweeping conclusion about Peking University graduates.--------------------- irrelevant
(B) It is irrelevant to smaller corporations whether the largest corporations in China would agree to have significant numbers of representatives from Peking University on the boards of the largest corporations.------------------- small corporations are not mentioned
(C) It is a mistake to take the 300 largest Chinese corporations to be typical of corporate boardrooms generally. -------------------- typical of corporate boardrooms are not mentioned
(D)The percentage of graduates from Peking University who serve on the boards of the 300 largest Chinese corporations reveals little about the percentage of the members of these boards who are from Peking University. ------------- correct
(E) The presence of graduates from Peking University on a corporate board does not necessarily imply that that corporation will be more financially successful than it has been in the past. ---------------------------------- irrelevant