The verb "confess" specifically means to admit or acknowledge wrongdoing, which is precisely the sense needed with "your crime", giving the natural phrase "confess your crime".
"Pardon" means to forgive, which is the opposite direction of meaning from admitting guilt, "apologizing" doesn't fit grammatically in this slot, and "agree" doesn't carry the sense of admitting wrongdoing at all.
So "Confess" is the word that correctly completes the sentence.