Verified Answer :

The sphincter is the voluntary or involuntary closing and opening
of a certain tube or tract inside your body. The sphincter of the digestive tract controls the amount of
materials going out of the body. Sphincter controls the amount of food that can
empty be emptied into the duodenum.

Answer:

B. They control and direct the quantity of food passing through the digestive organs and prevent backward movement of partially digested food.

Explanation:

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