Environmental
In Montana, 'selenium contamination' from coal mining and irrigation drainage in the eastern part of the state is a concern because:
ASelenium is a beneficial mineral with no toxicity concerns
BAt elevated concentrations, selenium is toxic to aquatic life and can accumulate in the food chain, affecting wildlife and human health✓ Correct
CSelenium only affects agricultural crops, not drinking water
DSelenium is regulated only by local county ordinances
Explanation
Selenium from coal mining spoils and irrigation return flows in eastern Montana can reach toxic concentrations in surface water and sediments. It bioaccumulates in fish and wildlife, affecting aquatic ecosystems and potentially human health through food chain exposure.
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