Water pollution is the process through which a source of water supply becomes contaminated as a result of exposure to pollutants or dangerous chemical substances.
The Clean Water Act is a basic law of the United States of America passed by the 92nd United States Congress to ban service-related releases of all toxins into water bodies and to recover and preserve, the chemical, and biological integrity of the country's water supply.
Finally, the Clean Water Act is a regulation that serves as the primary law governing water contamination.
Thus Option B is correct.
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