Why did people criticize Realism at the time?

Critics have cited a lack of precision and contradictions in the use of concepts such as power, national interest, and balance of power by realists. Possible contradictions are also evident between central descriptive and prescriptive components of realism

the answer is b. i'm positive it's that answer.

i believe their role is to instruct certain sections on when they are to join and when they are to stop