Question

which are (is) the strongest pumping chamber(s)?
a atria
b ventricles
c aorta

Explanation:

The ventricles are the strongest pumping chambers of the heart. The atria primarily receive blood and have less muscular walls compared to the ventricles. The aorta is a blood vessel, not a chamber of the heart. The ventricles, especially the left ventricle (which pumps blood to the entire body), have thick muscular walls to generate the force needed for circulation.

Answer:

B. Ventricles