In Traditional Cultures, Men's Mortality Rate Due to Warfare and Homicide

In traditional cultures, men's mortality rate due to warfare and homicide is quite high, sometimes even as high as 36 percent. This implies that __________.

A) there was likely recurrently high selective pressure on men to evolve anti-homicide mechanisms
B) men with aggressive tendencies would rarely reproduce
C) children exposed to this contingency between men's aggression and early death would exhibit less aggression in adulthood
D) the heritability of aggressive traits is low