Which of the Following Is Grammatically Correct According to the APA

Multiple Choice

Which of the following is grammatically correct according to the APA Publication Manual?

A) The research cannot be considered valid since the sample size was too small.
B) While most people consider themselves religious, only a small percentage actually attend religious services regularly.
C) While participants filled out the questionnaires, a power saw operated nearby.
D) All of the above are correct.