Correct option is B
The correct answer is (b) Both A and R are true and R is the correct explanation of A.
Assertion A is true: The stomach produces hydrochloric acid (HCl), a strong acid, which plays a crucial role in food breakdown. HCl helps in protein digestion by denaturing the proteins, making them more accessible to digestive enzymes. It also activates some digestive enzymes and creates an acidic environment that is optimal for their activity.
Reason R is true: Digestive juices, including enzymes, generally work best in an acidic environment. The acidic medium provided by hydrochloric acid in the stomach is essential for the proper functioning of these digestive enzymes.