How Do Anthropologists Account for Fundamental Cultural Differences Such as How

How do anthropologists account for fundamental cultural differences such as how people marry, contemplate death, or recognize what counts as food?

A) People's views on these issues are products of their environment.
B) Certain perspectives are less modern, and most likely will disappear.
C) Meanings are ascribed by those who share, use, and experience these issues.
D) These differences are by-products of biological differences.