Biology

Answer: C

Explanation:

Correct Option: Since lactose - intolerant people lack the lactase enzyme, lactose cannot be properly broken down.
The undigested lactose then ferments in the gut, producing gas and causing symptoms like abdominal pain, bloating, and diarrhea.

Incorrect Options:

Option A: Lactose - intolerant people have difficulty absorbing lactose, not more efficient absorption.
Th...