When does cultural diffusion happen

 It happens when another culture shared their beliefs with a different culture.

Explanation:

Cultural diffusion is when something from one area or culture spreads to another area or culture regardless of its location or climate zone. As more cultures come into contact with each other, more ideas and products spread and are shared.

i think the answer is a and i hope this ; ))

the policy of appeasement influenced the beginning of ww2 because hitler gave the other countrys chocies but after they choose to try and appease hitler to not invade their country but he still invaded them.