What is Confucianism?

A. an Indian religion

B. a polytheistic Chinese religion

C. a Mesopotamian religion

D. a Chinese philosophy focused on social relations

Confucianism is a Chinese system of beliefs (you could argue it's a religion, but it's more a system of beliefs and philosophy) based on respecting the elders and up-keeping the hierarchical structure of the society.

The correct answer is D!