Step 1: A is the brother of R.
This means A and R are siblings, and A is male.
Step 2: C is the mother of B.
This tells us that C is the parent of B (C is female).
Step 3: M is the sister of C.
This tells us that M and C are siblings, and M is female.
Final Relationship:
Since M is the sister of B's mother (C), M is B’s maternal aunt.
Correct Answer: Option 3 – Aunt
M is the sister of C, and C is the mother of B. That makes M the aunt of B through the maternal side. Therefore, M is B’s aunt.