B is correct. If B is true, then Alan's reason for taking the vitamins is wrong since it is not proven that the vitamins are effective for cross-country.
A --> May be correct but B is a much better answer, since Option A compares the 400m dash vs cross country events which may be a plausible comparison since both involve running.
C --> Not relevant to whether taking vitamins will help to improve his rankings
D --> Not relevant to whether taking vitamins will help to improve his rankings
E --> This in fact supports Alan's reasoning.
Gary Johnson, a major star in track and field, advertises a certain brand of vitamin supplements for aspiring athletes. Alan runs cross country for his university and has decided to start a fitness regimen including the vitamins to improve his event rankings.
Which of the following, if true, most clearly points to a flaw in Alan's reasoning?
(A) Gary Johnson runs the 400-meter dash, not cross country events.
(B) The vitamins are designed to build muscles for shot put and discus throwers.
(C) Alan's coach recommends a fitness program that includes vitamins and conditioning exercises.
(D) While Alan’s performance has remained steady over the last year, his event rankings have dropped because of the improved performance of his competitors.
(E) The efficacy of the vitamins has mainly been tested on college-aged athletes.