The Sinoatrial node is the normal pacemaker of the human heart because it

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is located in the right atrium

is the only part of conducting system that can generate action potentials

can generate maximum number of action potentials in the conducting system

produces action potentials that are more in size than the other parts of the conduction system

answer is C.

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Detailed Solution

SA node can generate maximum number of action potentials to maintain rhythm city of heart.

The SA node is a cluster of autorhythmic fibers located in the heart. These fibers can initiate an action potential (a signal for heart muscle contraction) about every 0.6 seconds or 100 times per minute. This makes the SA node the natural pacemaker of the heart because it generates electrical signals at a faster rate than any other autorhythmic fibers.
The SA node's inherent rate of generating action potentials establishes the fundamental rhythm for heart contractions.