Dozens of Social-Psychological Experiments on the Topic of Social Facilitation

Dozens of social-psychological experiments on the topic of social facilitation have employed people and a variety of animals and insects. One consistent finding has emerged from these many studies:

A) Simple tasks are not affected by the presence of others, but complex tasks are.
B) The presence of others enhances performance on simple tasks.
C) Simplicity is the most dominant response in the presence of others.
D) Difficult tasks are more arousing than simple tasks.