Ingham and Colleagues (1974)asked Participants to Pull on a Rope

Multiple Choice

Ingham and colleagues (1974) asked participants to pull on a rope and found that participants pulled almost 20 percent harder when they thought they were pulling alone than when they thought they were part of a group.This finding best illustrates

A) social loafing.
B) a social dilemma.
C) groupthink.
D) social facilitation.