Question

キートン

英語の文法問題です。合っているのか確認お願いします。ちなみにcとaで悩みました、ので解説もできればお願いします。

32.
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a He is respected not just because of what he did on-screen but also
because of his immense impact off-screen as a campaigner of civil rights.
He is respected not just because of that he did on-screen but also
because his immense impact off-screen as a campaigner of civil rights.
He is respected not just because of did he on-screen but also because he
immense impact off-screen as a campaigner of civil rights.
him
d. He is respected not just because that he did on-screen but also because
of he immense impact off-screen as a campaigner of civil rights.