i prefer to e,for you can see the first sentense,Behavior science courses should be gaining prominence in business school curricula
Yet the behavior sciences are struggling for credibility in many business schools,so the whole passage places the emphasis on the latter and explain the reasons.
I crossed out E because it only covered the contents of the second paragraph. What about the first and the third?
The primary purpose is not to identify(E) factors, but to propose(A) sth..., the factors covered in the 2nd and 3rd paragraphs are telling why the existing conditions are such... need to be changed. (Yet...)