The Nurse Notes That a Patient with a History of a Myocardial

The nurse notes that a patient with a history of a myocardial infarction is straining during defecation.Which response by the nurse is best?

A) "Be careful, you might get a headache when you push so hard."
B) "It is important that you not strain because it could cause damage to your heart."
C) "Your blood pressure gets very low when you strain like that and you could faint."
D) "Chronic constipation often causes a dilated colon, so it is good that you are staying empty."