What happens in chapter 8 of Night that Elie says made him feel "ashamed of [himself] forever"?

a
For a moment, he considered abandoning his father to take care of himself.
b
He left his father sick and alone in the infirmary.
c
He stole his father's ration of bread.
d
He lied to his father about the seriousness of his illness.

The correct answer is a. For a moment, he considered abandoning his father to take care of himself.