Heart is a muscular and involuntary organ and have four chamber present in it. So the correct option is B.
What are involuntary movement?
Involuntary movement comprises of a group of uncontrolled movements that may shows a shaking, chorea, dystonia. The involuntary muscles actions are mainly controlled by the central nervous system in the body. These involuntary muscles are smooth muscles and cardiac muscles. the below figure representing the chamber of heart.
Human hear have left atrium, right atrium, left ventricle, right ventricle.
Arteries are thin, less muscular walls and smaller. These receives blood that are fed by the large veins.
Ventricles are large, more muscular chambers which are responsible for pumping and pushing blood out to the circulation.
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