Performance on A(n) __________ Task Is Likely to Improve Given

Performance on a(n) __________ task is likely to improve given the presence of others whereas performance on a(n) __________ task is likely to become impaired given the presence of others.

A) very simple; very difficult
B) as yet unmastered; simple
C) familiar; unfamiliar
D) physically demanding; physically challenging
E) difficult; simple