In the Authors' Example of Proposed Legal Education Research, a Questionnaire

In the authors' example of proposed legal education research, a questionnaire would be administered at the time the bar exam was taken. This technique was deemed unethical because

A) the results would be affected by the administration of the bar exam
B) those taking the bar had not consented to take the questionnaire
C) findings are not valid when large groups of subjects take a questionnaire at the same time
D) those taking the bar would want to make their law school look good, thus invalidating the results