During a regular meeting, a client is complaining of irregular gastrointestinal issues, ranging from diarrhea to constipation. What is the best course of action?

A. Closely monitor his situation and re-evaluate during the next meeting.
B. Evaluate his prescription medications to look for similar side effects.
C. Advise him to eat more vegetables and drink more water.
D. Advise him to make an appointment with his personal physician.