What are 3 choices Elie had to make?

Elie could have chosen to comfort his father when he called for him in the night, but he chose not to because he was more afraid of what the Nazi prison guards would do to him were he to break the rules and move from his bed. Elie regrets his cowardice regarding this event and wishes he had comforted his father instead of worrying about himself, but this shows how big self-preservation became for most of the camp inmates.
Elie also chooses not to celebrate Rosh Hashanah with his fellow inmates. He does so because he is angry with God for allowing the Jewish community to be killed and tortured, so he sees no reason to praise God's name. This shows his loss of faith once he was exposed to the nightmarish realities of concentration camp life.
Another choice Elie had to make was when Rabbi Eliahou asked where his son was. Knowing the son abandoned his father due to the rabbi's limping, Elie chooses not to tell the rabbi the truth, knowing it would break his heart. This shows Elie is willing to lie to spare another's feelings in such an awful situation. People's will to go on often depended on the love of family members and friends, and Elie knows this information could potentially destroy the rabbi.