At the time of performing the psychology experiment, the technique named deception may be used only when it is necessary for the subject and does not inflict serious harm on him or her. Hence, Option C is correct.
In psychology, there are sometimes situation is like a researcher has to give information to te subject which is false. The reason behind this act is to mislead the subject intentionally about some key aspect of the research. It may involve giving such kind of feedback in which false beliefs were created about either oneself or a relationship.
It also involves the manipulation of one's self-concept. There are types of deception also. They are deliberately misleading and deceive by omission. In the first one, the researcher uses confederates, staged manipulations in field settings, and deceptive instructions and in the second the researcher fails in disclosing the full information about the study or creates ambiguity.
Thus, Option C is correct.
Learn more about deception from here:
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