Which Statement Is True

Multiple Choice

Which statement is true?

A) On simple,individualistic tasks people work better when alone rather than in the presence of others.
B) Because competition motivates,people working on complicated tasks are more efficient when they work in the same room rather than in isolation.
C) For both simple and complex tasks,environmental distractions invariably undermine the quality of performance.
D) The presence of others speeds up the performance of simple,well-learned tasks.