Which of these events is most likely the result of cultural diffusion? A. Two civilizations that are three hundred miles apart grow very different kinds of crops.

B. Two civilizations on opposite sides of a mountain range sometimes hunt the same animals for food.

C Two civilizations that share a river valley have very different ideas about how men and women should behave.

D. Two civilizations along the same river have very similar religious beliefs and marriage customs.

D.

Explanation:

Cultural diffusion is defined as the influence of one culture to another culture such as culture's practices, food, music, and beliefs. Cultural diffusion occurs regardless of location or geography. The major reasons of cultural diffusion are trade, war, and exploration.

Cultural diffusion can be seen between two civilizations along the same river, have very similar religious beliefs and marriage customs. Being two different civilizations, religious beliefs and marriage customs might spread from one civilization to another, as they live along the same river.

Hence, the correct answer is "D."