Final answer:
The correct question for a nurse to ask to assess a client's perception of the event leading to the crisis is "What leads you to seek help now?", helping to provide tailored care and support.
Step-by-step explanation:
The appropriate question a nurse should ask when assessing a client's perception of the precipitating event that led to the crisis is: C) "What leads you to seek help now?" This question is aimed directly at understanding the client's perspective of the event that triggered the current crisis. It allows the nurse to gain insight into the client's thought process and emotional response, which is crucial for providing tailored care and support.
In contrast, questions A) "With whom do you live?", B) "Who is available to help you?", and D) "What do you usually do to feel better?" could provide useful information for developing a support plan but do not directly address the client's perception of the precipitating event.