The answer you are looking for it "B.) Reduction in acid rain". This is literally the only positive thing listed, so it's kind of obvious tbh. Acid rain wears away as stone and causes severe damage, so a reduction of harmful energy sources could lead to a loss of this harmful rain.
Your answer would be B. The most dangerous job in the United States. Because the cave can come down, if you don't have the right equipment you can damage your lungs, and you may get stuck down there, or really hurt.
