Which of the Following Is Not an Ethical Guideline Proposed

Which of the following is not an ethical guideline proposed by Aronson in conducting an experiment?

A) Procedures that cause intense pain or discomfort should be avoided.
B) Experimenters should be ever alert to alternative procedures to deception. If some other viable procedure can be found, it should be used.
C) Deception, in general, can be justified in all experiments, provided that the subjects are adequately debriefed at the end.
D) Experimenters should provide their subjects with the real option of quitting the experiment if their discomfort becomes too intense.