Option C: Q
To determine who is definitely a man among the given options, we need to analyze the information provided in the question. However, the question does not provide any specific statements or context about the gender of P, S, or Q. Therefore, without additional information or context, it is impossible to definitively conclude the gender of P, S, or Q based solely on the options provided.
     Since the question states that the correct answer is "c: Q," we must assume that there is some implicit or external information indicating that Q is definitely a man. However, based on the information given in the question alone, we cannot independently verify this conclusion.
     Therefore, the answer is Option C: Q, as per the provided correct answer, but it is important to note that this conclusion relies on information not explicitly stated in the question.