A transit company’s bus drivers are evaluated by supervisors riding with ... ...

A transit company’s bus drivers are evaluated by supervisors riding with each driver. Drivers complain that this affects their performance, but because the supervisor’s presence affects every driver’s performance, those drivers performing best with a supervisor aboard will likely also be the best drivers under normal conditions. Which one of the following is an assumption on which the argument depends?
(A) There is no effective way of evaluating the bus drivers’ performance without having supervisors ride with them.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2011 LSAT (PT 63): Logical Reasoning B

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