The manipulations in Milgram's studies that decreased obedience all involved:

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Milgram's studies found that when participants were given more personal responsibility for their actions, they were less likely to obey authority. For example, when they were able to choose their own level of shock rather than being instructed, or when they had to physically force the learner's hand onto the shock plate, obedience levels decreased. The other options (B, C, D) did not consistently result in decreased obedience in Milgram's studies.

The Manipulations in Milgram's Studies That Decreased Obedience All Involved