During assessment of a client's abdomen, the nurse observes that the client's umbilicus is depressed and below the surface of the abdomen. Which action should the nurse take in response to this observation?

A. Palpate the area for masses. Palpating for masses is important but is not specifically indicated by the observation of a depressed umbilicus. B. Ask about recent abdominal trauma. Asking about trauma can be important but is not directly related to the finding. C. Document the normal finding. This is the best choice because a depressed umbilicus is a normal variation and does not typically indicate pathology. D. Observe the midline for scarring. Observing for scarring can be part of the assessment but is not directly indicated by the finding of a depressed umbilicus.