The Client Is in Shock with a Blood Pressure of 60/20

The client is in shock with a blood pressure of 60/20 mm/Hg. The physician orders isoproterenol (Isuprel) intravenously (IV) . The family is quite anxious and asks what "that liquid" is for. What is the best response of the nurse?

A) "It is called a vasopressor and will help the kidneys increase and maintain blood pressure."
B) "Vasopressor drugs act on the renin -angiotension system and thus increase blood pressure."
C) "This drug is a vasopressor and will help stabilize blood pressure by making the blood vessels smaller."
D) "This drug is a vasopressor and helps the heart beat more effectively, which will increase blood pressure."