It would be B I believe. It is the most logical sentence and it fits the tone.
The most essential point or I would say quality which kept Elie Wiesel and his father determined to survive is definitely Eliezer's perception of reality. He understood how things work and the thing which helped him <span>is his ablility to recognize the demands of a particular situation and ability to fit in it.
Hope it will help you in some measure!
Regards.</span>
Jil was not only very ill from not gettin no sleep she was over weight from a bad diet