Concept:Tracing family relations step-by-step to determine how A is related to D.
Explanation:• "B is the brother of A" means A and B are siblings; gender of A is not specified yet.
• "Whose only sister is mother of C" — the "whose" refers to A. So A has one sister, and that sister is the mother of C.
• Thus, A's sister = mother of C.
• "D is maternal grandmother of C" means D is the mother of C's mother. So D is the mother of A's sister.
• Since A and A's sister are siblings, they share the same mother. Therefore D is also the mother of A.
• A is child of D. Options include "Daughter" (female child) and "Nephew" (male child of sibling). Nephew would mean D is not mother but aunt, which is not the case. So A must be a daughter.
• Hence A is D's daughter.
Answer:Daughter