___ muscle lines your digestive tract and blood vessels. This muscle moves food and blood through your body.

a. Skeletal
b. Cardiac
c. Smooth

c. Smooth

The muscle that lines your digestive tract and blood vessels is known as smooth muscle. To identify the correct answer, we can go through a process of elimination:

a. Skeletal muscle: This type of muscle is responsible for voluntary movements, such as those involved in walking or lifting objects. It is attached to the bones and allows us to consciously control our movements. Since it is not responsible for moving food and blood through the body, we can eliminate this option.

b. Cardiac muscle: This type of muscle makes up the walls of the heart and is responsible for pumping blood throughout the body. While it does move blood through the body, it does not play a role in moving food through the digestive tract. Therefore, we can eliminate this option as well.

c. Smooth muscle: This type of muscle is found in the walls of hollow organs, including the digestive tract and blood vessels. Smooth muscle contracts and relaxes involuntarily to move substances through these organs. It is responsible for peristalsis, the muscular contractions that push food through the digestive system, as well as regulating blood flow in the blood vessels. Therefore, the correct answer is smooth muscle.

In summary, the correct answer is c. Smooth.