Final answer:
People who share the same culture are referred to as an ethnic group. Ethnicity is based on shared culture, including language, religion, and traditions. Therefore, the correct option is (a) an ethnic group
Step-by-step explanation:
People who share the same culture are referred to as an ethnic group. Ethnicity is based on shared culture, including language, religion, and traditions. Ethnic groups can be identified or self-identified and may have common characteristics such as culture, religion, or language.