Which statement describes the condition of the heart at the point indicated in the electrocardiogram? A. The atria are contracting and pushing blood into the bottom ventricles of the heart.
B. The ventricles are contracting and pushing blood out of the heart to the lungs and body.
C. The valves between the atria and ventricles close, producing the first heartbeat.
D. The valves of the aorta and pulmonary artery close, producing the first heartbeat.

The answer is c

Explanation:

The valves between the atria and ventricles close, producing the first heartbeat. I tried D, but I was wrong and others have said that it wasn't A or B.

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there

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