(B) "antithesis"
"Antithesis" refers to the complete opposite. The line would read "At the family reunion Hiroko found her cousin lovely and gentle, the antithesis of his earlier unpleasant and dominating nature," if one were to introduce this word into the text.
The phrase implies a significant shift in Hiroko's cousin. Now "charming and gentle," he was formerly "rude and overbearing." The word "antithesis" aptly captures this abrupt shift.
The meanings of the remaining choices, A, C, D, and E, are all inappropriate, hence they are all incorrect.
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