Vegita wrote:
I read in the Manhattan sentence correction book that the word 'that' when used as a pronoun is an essential modifier, and 'that' cannot be preceded by a comma.
This was my only reason to eliminate option A.
Yes, that is the traditional norm: when the word THAT is used as a relative pronoun (as in Option A), it should introduce an essential modifier.
This is a pared-down version of OptionA:
Bluegrass musician Bill Monroe was also an inspiration to many musicians, that included
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