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That would be the Digestive system where the food breaks into nutrients.
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The answer is B. digestive

Digestive system is the system that the food we eat is being break down and digested so that the nutrients can be used by our body 

The system start in the mouth by chewing and grinding food into smaller pieces the goes into the esophagus then the stomach which breaks down the food we eat by using an acid with a pH of 2 . Then the food will go in the small intestines to get the nutrients and goes to the large intestines that absorbs the remaining nutrients and after a few hours the food is released into poop.
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