B, as there is no point in a comma there. There is already an and in the sentence which is a conjunction.
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By the rhetoric of talk or persuasive language, Bobby Kennedy advances to the American individuals, right off the bat to the dark individuals to not look for retribution and savagery against white individuals, but instead expand sympathy and understanding and a craving to live respectively to both highly contrasting individuals.
Concerning parallelism, in a similar vein, he says that what we don't require is division, brutality and disdain yet love and sympathy so he is differentiating the two by creating them both with their outcomes in a parallel design.
