The correct answer to this question is B, Cardiac Muscle. This muscle is also known as the heart muscle, which is because the muscle is found in the walls of the heart. The tissue myocardium includes cardiac muscle. Though it is essential to one's body, a person has no control over the heart muscle.
There are three main types of muscles, and the cardiac muscle is one of them. The other two are the skeletal and smooth muscles. When the cardiac muscle contracts, it pushes blood out of the atria and into the blood vessels and to the lungs.