Which of the Following Is TRUE with Regard to the Deception

Which of the following is TRUE with regard to the deception of research participants?

A) It is not allowed under any circumstances.
B) The researcher must tell the participants about the deception after the study.
C) The researcher must obtain approval of the procedure from a special national review board.
D) The researcher need only tell the participants about the deception if not telling them would place the participants in any harm.