The correct answers are B, C and D.
This excerpt from Elie Wiesel's "Night" shows how Eliezer has to decide whether to accept the inmate's advice or not. He did not know the man, so he could not guess his intentions. He has an internal conflic about whether he should trust the inmate and lie about his age or not.
However, the fear produced by what Dr. Mengele could do to him if he was underaged makes him take the advice and lie.