The spread of culture through interaction and trade is called ______________ .

A. ethnocentrism
B. melting pot
C. equal opportunity
D. cultural diffusion

The correct answer is D. cultural diffusion.

To arrive at this answer, we need to understand the meaning of each of the options and choose the one that fits the description of the spread of culture through interaction and trade.

A. Ethnocentrism refers to the belief in the superiority of one's own culture, often leading to the judgment or negative perception of other cultures. It does not describe the spread of culture.

B. Melting pot is a term used to describe a society or community where people from different cultures and backgrounds come together and assimilate into a single unified culture. It does not specifically address the spread of culture through interaction and trade.

C. Equal opportunity refers to the principle of fairness in providing people with equal access to opportunities, regardless of their cultural background. While it is an important concept, it does not relate directly to the spread of culture.

D. Cultural diffusion is the process by which cultural traits, such as ideas, customs, beliefs, and practices, are spread from one society or culture to another through interaction, trade, or migration. This aligns with the description in the question and is the correct answer.

Therefore, the correct answer is D. cultural diffusion.