Answer:
b.It aids the transformation of bolus into chyme.
Step-by-step explanation:
In the stomach, food is mixed with stomach secretion, gastric juice (a solution rich in hydrochloric acid and enzymes (pepsin and renin).
The stomach produces about three liters of gastric juice a day. Food can remain in the stomach for up to four hours or more and mixes with gastric juice aided by stomach muscle contractions. The cake turns into an acidified, semi-liquid mass, the fifth. Passing through a muscle sphincter (the pylorus), the chyme is gradually released into the small intestine, where the most important part of digestion occurs.