The Historical View of High Rates of Violence Among the Yanomami

The historical view of high rates of violence among the Yanomami emphasizes

A) the unbalanced sex ratio (scarcity of women) as a motivation for conflict.
B) how high rates of warfare are a response to "protein hunger."
C) the role of the increased presence of Westerners in the region.
D) its adaptive role in keeping population growth rates down.
E) how such warfare has increased the biological adaptiveness of the population by favoring the reproduction of strong males.