A client at the healthcare clinic reports a new onset of pyrosis and dyspepsia to the nurse. Which nursing action has the highest priority?

A. Recommending antacids may temporarily relieve symptoms but does not address the need for diagnosis and possible treatment of an underlying condition. B. Providing reassurance without further evaluation risks delaying the identification of more serious conditions, such as peptic ulcer disease or cardiac issues. C. Instructing about reflux disease assumes a diagnosis that has not yet been confirmed. D. Scheduling a physical examination is the highest priority because new-onset pyrosis (heartburn) and dyspepsia (indigestion) require assessment to determine the cause and rule out serious conditions before initiating treatment.