Which of the Following Is a Characteristic of a Normal

Which of the following is a characteristic of a normal variation of heart and pulse rates, called a sinus arrhythmia?

A) The heart and pulse rate increase with inspiration and decreases with expiration.
B) The heart rate increases upon inspiration and the pulse rate increases with expiration.
C) The heart and pulse rate decrease with inspiration and increase with expiration.
D) The heart rate increases on inspiration and the pulse decreases upon expiration.