The Nurse Completing Morning Assessments on a Patient Who Is

The nurse completing morning assessments on a patient who is sitting up in bed is told by the patient, "I'm having trouble breathing-I can't seem to get enough air." The best nursing response is to:

A) notify the doctor as soon as he or she comes in later in the morning.
B) finish the vital signs for the assigned patients, and then notify the charge nurse.
C) reassure the patient, if his blood pressure and pulse are normal.
D) notify the charge nurse immediately of the patient's statement.