Which of the following is an example of a nonequivalent control group posttest-only design?

A. A researcher records coffee consumption among undergraduate and graduate students each day during the week of final exams.
B. A researcher gives psychology students a life skills training and records the time it takes psychology students, compared to sociology students, to complete the life skills assessment given after the training was complete.
C. A researcher records the weight of younger compared to older patients before and after a surgery.
D. A researcher records the weight of older patients before surgery.

Answer: B