The answer would be A. The rest of the sentence is in past tense, so that would also be.
One of Wiesel's concerns in Night is the way that exposure to inhuman cruelty can deprive even victims of their sense of morality and humanity. The first hint of this dehumanized behavior on the part of the Jewish prisoners comes when some of the deportees, in the contraints of the cattle car, lose their modesty and sense of sexual, inhibition. Wiesel suggests that one of the great psychological and moral tragedies of the Holocaust is not just the death of faith in God but also the death in faith in humankind.<span>
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