Question

which of these has contributed significantly to the reduction of many point source water pollution issues in the us over time?
the rising population of humans
increasing industrial discharges
strong environmental regulations

Explanation:

• "The rising population of humans" would likely increase water pollution due to more demand and waste, so it's not a contributor to reduction.
• "Increasing industrial discharges" would also increase pollution, not reduce it.
• "Strong environmental regulations" (like the Clean Water Act in the US) set standards for pollution control, requiring industries and others to limit discharges, which has significantly reduced point - source water pollution over time.

Answer:

C. strong environmental regulations (assuming the options are labeled A, B, C with A being "the rising population of humans", B being "increasing industrial discharges", and C being "strong environmental regulations")