The correct answer is B. A coating of mucus
Explanation:
In the stomach food that has been chewed is digested or broken down through the action of specialized enzymes and acid. This gastric acid is essential for digestion but is also highly corrosive. Due to this, the stomach produces mucus that forms a coating (known as the gastric mucosal barrier)and allows the stomach to contain the gastric acid without this affecting negatively the stomach lining. This implies that the stomach lining is protected from gastric acid by a coating of mucus.
