How does war contribute to cultural diffusion in modern times?

A.
Soldiers engaged in a war often adopt customs and practices of the opposing side to understand their enemy.
B.
People escaping war and taking refuge in other countries introduce their culture to the host country.
C.
People living in war-torn countries adopt a religion or cultural behavior to adapt to the wartime situation.
D.
War causes growth in imports of basic necessities, which causes exchange of cultural traits.