Environmentalists agree we must stop using coal powered plants. Which of the following causes the most concern about the impact of coal on the environment?
A. Leaks during mining can cause spills that pollute the ocean.
B. Mining for coal requires digging deep into the earth’s crust, which may cause fracking.
C. Many coal plants have had accidents that released radiation into the air.
D. Coal mining and usage causes much water, land, and air pollution.
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