Final answer:
Ethnic Boundaries are the type of boundaries based on social patterns of interaction such as language, religion, and history that shape group self-identification.
Step-by-step explanation:
The boundaries that are based on patterns of social interaction (language, religion, history) that determine a group's self-identification are B. Ethnic Boundaries. These boundaries are not necessarily aligned with political borders but instead are defined by the cultural ties that bind a specific group of people. Ethnic boundaries are delineated based on shared characteristics such as language, religion, and historical experience, which contribute to a group’s unique ethnic identity within a larger social and political framework.