I'd say B, thinking about it coming to an end.
Nick was referring to the discovery of George's body. Holocaust is defined as a slaughter...... Myrtle, Gatsby, and Tom had each lost their lives for nothing....... they were the sacrifice of those who didn't care for anything or anyone beyond themselves.
Hope this helps!
I would say the answer is B.
In a story, the setting is the time, place, and geographical location of where it is taking place.
B. Say to himself or herself, “Is that really true?