Which is most likely to be a theme of a naturalist novel

The theme of a naturalistic novels is often "a man against nature" or "man against himself" as characters struggle to retain a "veneer of civilization" despite external pressures that threaten to release the "brute within."

Atahualpaemperor of the inca empire who rose to the throne after winning a civil war between him and his brother.  -he refused to become a spanish vassal or christian.-francisco pizarro kidnapped him and demanded a huge ransom.  -pizarro's secretary described him as "a man of thirty years, good-looking and poised, somewhat stout, with a wide, handsome, and ferocious face, and the eyes flaming with blood."-after the ransom was paid, atahualpa was killed by pizarro