P is facing South. Q is seated third to the left of P. Who is seated immediately to the right of Q?

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1. **Given:** P faces south and Q is third to P's left.

2. We need the total number of people to fix exact seats. That number is not given.

3. Example 1 (4 people): Moving 3 seats left is the same as 1 seat right, since $3\equiv -1\pmod{4}$. So Q is immediately right of P. Then the person immediately right of Q is **P** (option a).

4. Example 2 (6 people): Moving 3 seats left puts Q opposite P. Then the person immediately right of Q is the person second to the right of P (option c).

5. These two valid cases give different answers. So the question cannot be decided from the information given.

FINAL_ANSWER: d

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