Why Did Congress Require the Environmental Protection Agency to Establish

Why did Congress require the Environmental Protection Agency to establish minimum drinking water standards?

A) Long-term exposure to small amounts of chemicals was proven to be hazardous.
B) Levels of contaminants in municipal drinking water systems rose to toxic levels.
C) The long-term effects of small amounts of chemical contamination were unknown.
D) Laboratory detection limits of common contaminants became much more sensitive.

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