IMO correct answer is BA survey of American business schools concludes that female students are more concerned about job discrimination than male students.
(A) female students are more concerned about job discrimination than male students -
If we go by the meaning, incorrect comparison is stated here, a clause "female students are more concerned about job discrimination" is being compared with a phrase "male students" - (Lets go by the meaning - it is stating that female students are more concerned about job discrimination, they are less concerned about "male students" )- Incorrect(B) female students are more concerned about job discrimination than male students are -
Correct; as both the entities being compared are in same form - (also - meaning is kept intact)(C) female students, as opposed to male students, are more concerned about job discrimination -
"as opposed to male students" is used as a modifier, that is modifying "female students", this usage in not correct as per the context of the sentence - Incorrect(D) female students are more concerned about job discrimination than male students are concerned -
Redundant usage of "concerned" again. - Incorrect(E) female students are more concerned about job discrimination than their male counterparts -
awkward usage & again incorrect comparison as stated in Option A