The nursing assistant reports to the nurse that a client who is one-day postoperative after an angioplasty is refusing to eat and states, 'I just don't feel good.' Which of the following actions, if taken by the nurse, is BEST?

B The nurse instructs the nursing assistant to sit with the client while he eats. C The nurse contacts the physician to obtain an order for an antacid. D The nurse evaluates the most recent vital signs recorded in the chart. A The nurse talks with the client about how he is feeling.