Answer:
D. Colleges put too much emphasis on standard test scores.
Step-by-step explanation:
A controversial argument is a dispute concerning a matter of public opinion or point of view.
The other options given had no controversy in what they say, A and C are factual arguments. While B is also an opinion like D but is not a controversial one.
The option claimed in D is very probable to start a debate.
I hope this answer helps you.