Studies Investigating the Role of Evaluation Apprehension in Social Facilitation

Studies investigating the role of evaluation apprehension in social facilitation have found that on the whole:

A) evaluation apprehension is necessary for social facilitation to occur
B) evaluation apprehension is neither necessary nor sufficient for social apprehension to occur
C) evaluation apprehension only enhances performance
D) social facilitation can take place in the absence of evaluation apprehension
E) none of the above