The answer D seems the most reasonable
Answer:
The phrase "whose selfishness had not hesitated to buy its own peace at the price, perhaps, of the existence of the whole human race" best supports the the that humans posses the ability to be monstrous. The phrase shows how humans are only thinking of what they want and need and not about how their voices affect the people and things around them.
Ethos is demonstrated when the character is described in a literary nonfiction. In Autobiography, the ethos describes what and how the author, was like. In a personal essay, the author describes the characters in the essay to express his or her feelings. In a memoir the ethos is when a person or thing that was part of the event are shown and described.