Which of these is NOT a reason why deception is commonly used in social psychological experiments?

Question

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Deception is commonly used in social psychological experiments for reasons such as reducing demand characteristics, creating the conditions necessary to test a hypothesis, and creating an artificial situation that is psychologically involving and convincing for the participant. The purpose is not to determine if participants can guess how they are being deceived, as that could potentially confound the results and make it more difficult to draw conclusions about the effects of the experimental manipulation.

Which of These Is NOT a Reason Why Deception Is