My answer is
(B). I am audacious to pick (B) without reading through the other three options. It may not be advised, but in doing so, I only spent 1:01 on this "parallel reasoning" question, which can be most time-consuming.
The researcher's reasoning structure is as follows:
(1) a result about two correlated events is presented. It seems to suggest a causal relationship. Someone might jump to the obvious conclusion (Higher Ed -> Better Math Skill).
(2) (conclusion) the "obvious conclusion" is not endorsed by the researcher.
(3) the reason for the conclusion is forwarded: It is possible that the reverse is the case. (Better Math Skill -> Higher Ed).
To find the correct answer, we insist on the
most similar parallel.
(A) The result does not naturally lend itself to a casual relationship. We can eliminate it.
(B) (1) a result about two correlated events is presented. It seems to suggest a causal relationship. Someone might jump to the obvious conclusion (Going pro -> better performance).
(2) (conclusion) the "obvious conclusion" is not endorsed by the author.
(3) the reason for the conclusion is forwarded: It is possible that the reverse is the case. (better performance -> Going pro ).
Because (B) matches researcher's reasoning to a T, I think it is worth picking the B and moving to the next question.
(C) Say, if "employers are impressed by the mere fact that the students are from more prestigious schools", those prestigious schools can still claim that they prepare students well for the job market. The prestige is part of the deal.
Of course, the major reason we eliminate (C) is that it does not exactly match the reasoning of the researcher's.
(D) It matches (1)and(2) of the researcher's reasoning, but in (3), it forwards a different reason.
This reasoning could be parallel if it were to opine that "... since it is possible that those who would become better politicians are those who would obtain law degrees".
(E) This argument discusses a result for "
some people". This alone makes it not quite parallel.
More seriously, in (3), it offers a reason that is not parallel.