Which of the Following Topics Would Be Appropriate for Evaluation

Which of the following topics would be appropriate for evaluation research?

A) Examining whether fee reductions 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) All of these choices are appropriate topics for evaluation research.