Can some one help me ,please,i wnat to know why this is ture .?

Which of the followign is ture?

A. The parasympathetic activity increase heart rate but the sympathetic activity slows it down.

B. The The sympathetic activity increase heart rate but the parasympathetic activity slows it down.

C. Sympathetic activity does not influence heart rate

D. Parasympathetic activity does not influence heart rate

E. Both a and b

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