Which of the Following Topics Would NOT Be Appropriate for Evaluation

Which of the following topics would NOT be appropriate for evaluation research?

A) Examining whether fee reduction at the local swimming pool increases pool use.
B) Examining whether women who get mammograms detect breast cancer earlier than women who do not.
C) Examining whether changes in speed limits influence traffic fatalities.
D) Examining whether the use of mediation in divorces results in "fairer" settlements.
E) Examining whether southern Americans are more likely to be Republicans or Democrats.