Final answer:
The correct option is D. A tribe is defined as a group with common ancestry and culture. Origin stories are essential as they contribute to a tribe's identity and unity. The terms tribe and ethnic group are sometimes used interchangeably in anthropology.
Step-by-step explanation:
The term that is defined as a group with common ancestry and culture is tribe. Tribes are characterized by a sense of common ancestry and shared cultural characteristics that may include language, religion, historical experiences, and traditions. Origin stories within a tribe serve multiple purposes: they explain where a group came from, clarify a group's place in the world, promote a common cultural identity, and thus strengthen the social cohesion among its members.
Additionally, anthropologists sometimes use the term ethnic group to describe large collectives based on common ancestry and culture. Members of a national identity group share common ethnic, religious, or linguistic identities and often seek recognition or autonomy within the political landscape.