C would be your answer because, it is a nonliving thing. It is not a living chemical or physical factor in the environment. I hope this helped!
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In a digestive tract, stomach is present at the distal end of the esophagus.
Stomach is a major part of digestive system and account for the digestion of protein. Stomach is a muscular organ, rich with secretary glands in it wall.
When food enters the stomach, it starts producing hydrochloric acid and two enzymes known as trypsin and chymotrypsin. These enzymes along with acid digest the protein component of the food.
Proteins are made of amino acids.
