Which of the following statements is the most accurate?

A) Generalist social work practitioners are also, by definition, family therapists
B) A family is a primary group whose members assume certain obligations for each other and generally share common residences
C) When working with families, family therapists must address a broader variety of problems than generalist practitioners
D) Family norms are individually prescribed patterns of behavior reinforced by the expectations of the family

A family is defined as a primary group where members have certain obligations towards each other and often share a common residence. This definition captures the essence of what constitutes a family in the context of social relationships and responsibilities. Options A, C, and D contain inaccuracies or overgeneralizations regarding the roles of generalist social work practitioners, the scope of problems addressed by family therapists compared to generalist practitioners, and the nature of family norms.