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 think it’s number 3 :) if not I am so sorry but to me that sounds like the best fit ☺️
Answer: The woman who gave this to me was very helpful