Concept:Identifying the grandmother relationship by tracing parent-child links.Explanation:• A is mother of B. • C is son of A, so C is brother of B. • E is daughter of B. • D is brother of E, so D is also child of B. • Therefore, B is parent of D. • The grandmother of D is the mother of B's parent. Since A is mother of B, A is grandmother of D.Answer:A