A is C's son. C and Q are sisters. Z is Q's mother. P is the son of Z. Then

The correct choice is: P is maternal uncle of A

C and Q are sisters and Z is Q's mother, so Z is also C's mother.

P is Z's son, so P is C's brother.

A is C's son, so P is the brother of A's mother. P is A's maternal uncle.

Hence the answer is ‘P is maternal uncle of A’.