Which of the Following Contributed to the Development of a Warfare-Dominated

Which of the following contributed to the development of a warfare-dominated culture in Europe?

A) Weapons were produced with minerals found in river-basin agricultural economies.
B) Mining output slashed the cost and increased the availability of raw materials needed for tools to clear forested land.
C) Local religions required human sacrifices, so warfare was required to obtain sufficient offerings to the gods.
D) Agricultural communities were producing surpluses, so residents had to protect their land and resources from encroaching neighbors.