The nurse assesses an adult client 24 hours following abdominal surgery and finds the client's blood pressure is 98/40 mm Hg. The client is tachycardic, restless, and irritable. Which action should the nurse perform first?

A Check under the back for evidence of bleeding. B Listen to lung sounds. C Ensure the IV solution is infusing at the prescribed rate. D Notify the healthcare provider of the findings.