A Patient's Blood Pressure Is 118/82

A patient's blood pressure is 118/82.He asks the nurse to explain "what the numbers mean." The nurse's best reply would be:

A) "The numbers are within normal range and are nothing to worry about."
B) "The bottom number is the diastolic pressure and reflects the stroke volume of the heart."
C) "The top number is the systolic blood pressure and reflects the pressure of the blood against the arteries when the heart contracts."
D) "The concept of blood pressure is difficult to understand. The main thing to be concerned about is the top number, or systolic blood pressure."