Solution

The goal is to find the expression that means "P is the maternal uncle of Q". This means P must be the brother of Q's mother.

Symbol Definitions:

• A + B → A is the mother of B
• A - B → A is the brother of B
• A % B → A is the father of B
• A × B → A is the sister of B

Analysis of Option C: P - M + N × Q

1. N × Q means 'N is the sister of Q'.
   
2. M + N means 'M is the mother of N'. Since N is Q's sister, M is also the mother of Q.
3. P - M means 'P is the brother of M'.
   

Combining these steps, we find that P is the brother of M, and M is the mother of Q. This makes P the maternal uncle of Q, which matches the required relationship.