A. When supply exceeds demand (APEX)
Another answer for apex users is "When supply is greater than demand."
B. The Clean Water Act.
Explanation:
This law came into place in the United States of America in the year 1972 during the 20th century and has maintained the law and control of clean distribution, usage and consumption by people the said country.
The Clean Water Act are laws found and are enforced in the United States Of America. It is a federal law whose works governs water pollution, and is administered by state environmental agencies and also EPA.