A 45-Year-Old Man Is in the Clinic for a Routine

A 45-year-old man is in the clinic for a routine physical examination.During the recording of his health history, the patient states that he has been having difficulty sleeping."I'll be sleeping great, and then I wake up and feel like I can't get my breath." The nurse's best response to this would be:

A) "When was your last electrocardiography done?"
B) "It's probably because it's been so hot at night."
C) "Do you have any history of problems with your heart?"
D) "Have you had a recent sinus infection or upper respiratory infection?"