Answer:
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. <u>Being two different civilizations, religious beliefs and marriage customs might spread from one civilization to another, as they live along the same river.</u>
Hence, the correct answer is "D."
