Environmental

Radon is a significant environmental concern in Maine because:

AMaine's industrial history has contaminated groundwater
BMaine's granite bedrock naturally produces radon gas✓ Correct
CCoastal sea air carries radon from offshore sources
DMaine's forests produce radon through decomposition

Explanation

Maine has significant radon concerns due to its granite bedrock geology. Radon gas is produced naturally by the decay of uranium in granite and can accumulate in homes, posing a lung cancer risk.

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