According to social facilitation theory,the presence of others will _____ performance on difficult tasks and _____ performance on simple tasks.

A) improve;impair
B) impair;improve
C) improve;not effect
D) not effect;improve

Social facilitation theory states that the presence of others can either improve or impair performance depending on the complexity of the task. When it is a simple task, the presence of others can improve performance as people are more likely to be aroused and energized in the presence of others. On the other hand, when it is a difficult task, the presence of others can impair performance as people may become more anxious and feel more pressure to perform well.