While obtaining a health history, a client tells the nurse that he sometimes experiences shortness of breath. The nurse determines that the client's respirations are regular and deep, and his respiratory rate is 14 breaths/minute. What is the best nursing action?

Ask the client to perform light exercise and observe the respiratory effort.

Document "dyspnea on exertion" in the client's medical record.

Ask the client to describe the episodes of dyspnea in more detail.

Explain to the client the possible causes of dyspnea or "shortness of breath."