College professor: College students do not write nearly as well as they used to. Almost all of the papers that my students have done for me this year have been poorly written and ungrammatical.
Which one of the following is the most serious weakness in the argument made by the professor?
(A) It requires confirmation that the change in the professor's students is representative of a change among college students in general. - CORRECT.
(B) It offers no proof to the effect that the professor is
an accurate judge of writing ability. - WRONG. This is like C only, focusing on non-core issue.
(C) It does not take into account the possibility that the
professor is a poor teacher. - WRONG. Did professor argued that he is good or bad? Not hitting the core of the argument of professor.
(D) It fails to present
contrary evidence. - WRONG. Irrelevant.
(E) It fails to
define its terms sufficiently. - WRONG. It's just a simple argument and need not to be complicated.
B and C might confuse some for simple reason that they might not have understood question stem properly. The question is about weakness in professor's argument not overall as presented.
Answer A.