To Ensure the Welfare of Participants in Studies Based on the Milgram

To ensure the welfare of participants in studies based on the Milgram experiment,recent modifications of the obedience procedure included

A) telling participants prior to the experiment that the shock they would administer was not real.
B) showing participants photos from the original obedience studies from the 1960s.
C) withholding payment for participation until all participants completed the study.
D) stopping the experiment once participants administered 150 volts, rather than 450.