What is a set of people related by blood, marriage, or adoption who share the primary responsibility for reproduction and caring for members of society?

The correct answer is family because it specifically refers to a group of individuals who are connected through biological ties, legal bonds such as marriage, or the bonds formed through adoption. Families are fundamental social units responsible for the nurturing and raising of children, providing care, and offering emotional support to their members. This makes them essential for the continuity of societies, as they play a critical role in socialization and transmitting values, norms, and culture across generations.

In contrast, a household typically refers to all people living in a single residence, which can include individuals who may not be related by blood or marriage. A community encompasses a broader group of individuals, often linked by geography or shared interests, but does not specifically imply familial connections. A social group is a more general term that can apply to any collection of individuals who interact and share a common identity or purpose, without necessarily implying familial relations. Thus, the family is distinct in its role and structure compared to these other concepts, highlighting its significance in society.