A nurse is caring for multiple clients on a mental health unit. Which of the following clients should the nurse attend to first?

C A client who has bipolar disorder and is continuously pacing at the end of the hall. D A client in the dayroom who is screaming at other clients about what is on the television. B A client who is standing in her room, yelling obscenities, and throwing her clothes. A A client who is repeatedly approaching the nurses' station to request medication for his anxiety.