But Starting Salaries for Men and Women Are Nearly the Same

Multiple Choice

But starting salaries for men and women are nearly the same when we look at each of Mountain Tech's schools (engineering, liberal arts, and so on) separately. This is an example of

A) using the mean when the median would be more appropriate.
B) an experiment without a control group.
C) internal inconsistency and an arithmetic mistake.
D) Simpson's paradox and more men in the schools whose graduates earn higher salaries.