Following Valve Replacement Surgery, the Patient Is Instructed to Notify

Following valve replacement surgery, the patient is instructed to notify the health care provider if fever, increased heart rate, fatigue, malaise, anorexia, weight loss, headache, chills, and/or night sweats occur. What is the nurse's rationale for this instruction?

A) These are manifestation of valve rejection.
B) These are manifestations of the type of heart failure associated with valve replacement.
C) These findings suggest that the patient is having a myocardial infarction.
D) These findings are manifestations of infective endocarditis.