Task: Question Understanding
Input (English): Question: A water company uses lab tests on the water supply before sending the water through pipes to people's homes. How do these lab tests help people? (A) by adding minerals and nutrients to the water (B) by checking the water to make sure it is safe to drink (C) by filtering chemicals and organisms out of the water (D) by stopping harmful substances from entering the water?
Output (English): lab, tests, water, help, people?