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by e-GMAT » Tue Aug 03, 2010 11:26 am
You are correct that "rate" is singular and hence use of plural "were" is incorrect.

However, in this sentence, as I understand the incorrect choice C - use of "were" is a special case of using the verb in hypothetical sense. As an example,

"I wish I were a big super star".

In hypothetical usage, singular subject takes on plural verb.

This is rather specific usage and I do not believe it is a widely tested concept on GMAT.