A Patient Who Has Chronic Heart Failure Tells the Nurse,"I

A patient who has chronic heart failure tells the nurse,"I was fine when I went to bed,but I woke up in the middle of the night feeling like I was suffocating!" The nurse will document this assessment finding as

A) orthopnea.
B) pulsus alternans.
C) paroxysmal nocturnal dyspnea.
D) acute bilateral pleural effusion.