Which Example Is NOT a Reason That Social Scientists Sometimes

Which example is NOT a reason that social scientists sometimes question the existence of IRBs?

A) IRBs are more fit to establish ethical guidelines for qualitative than quantitative research.
B) IRBs sometimes overstep intended purpose and limits.
C) IRBs can impede the search for answers to social problems.
D) IRBs help to mitigate risk of physical or emotional injury to research subjects.