Which of the following studies has had the most profound impact on ethical issues in psychological research? a Leon Festinger's study of cognitive dissonance b Solomon Asch's study of conformity c William McGuire's study of self-concept d Stanley Milgram's study of obedience e Daryl Bern's study of self-perception

d. Stanley Milgram's study of obedience

Explanation:

Stanley Milgram's test is also known as Shock test or Milgram Shock Experiment. Stanley Milgram conducted one of the most important and well known studies of obedience in psychological research at the Yale University.

Milgram Shock Experiment was important in psychological study because it they provided a frame of reference to the contemporary real-life situations of extreme and destructive obedience.

In his experiment, there was ethical issues of deception as the volunteer was not aware that they are giving shock to a real person and that the learner was a partner of Milgram's.

Hence the correct option is (d).