What Is a Common Outcome of Social Facilitation Upon People

What is a common outcome of social facilitation upon people performing simple tasks?

A) On simple tasks,people will lower their level of performance in the presence of others.
B) On simple tasks,people will increase their level of performance in the presence of others.
C) People can only ever perform simple tasks in the presence of others.
D) People can only perform complex tasks in the presence of others.