Answer:
The correct answer is:
OD. It can ensure that they can survive and thrive despite their low numbers.
Endogamy refers to the practice of marrying within a specific cultural or social group, and it can be particularly beneficial for minority communities that are at risk of losing their cultural identity due to assimilation into the dominant culture. By marrying within their own community, minority groups can maintain their cultural practices, beliefs, and values, which can help to ensure their survival and thriving despite their low numbers. This can also help to preserve their language, traditions, and history, which might otherwise be lost over time.