Based on the Findings of Milgram's Research, Which of the Following

Based on the findings of Milgram's research, which of the following led to the greatest decrease in harmful obedience in the study?

A) when the "student" complained about heart problems
B) when the "teacher" stood closer to the student
C) when the "teacher" actually touched the student
D) when the "teacher" actually administered the "shock"
E) when the "teacher" was solely responsible for the outcome