Correct Answer: D
Explanation:
|
C (father) |
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| D |
|
|
|
|
B (son) |
|
A (daughter) |
|
If T is the son of B, then T is a brother of A. If T has one brother, M, then A is the sister of M. Thus statement I is correct. M and B cannot be brothers because B is the father of M. Thus statement II is incorrect. C is the father of B, so C is the grandfather of M. Thus statement III is correct.