Acid precipitation has become more common in the last 200 years because a. more fossil fuels are being burned b. more toxic chemicals are being produced c. the climate has changed d. a hole has formed in the ozone layer

Acid precipitation has become more common in the last 200 years because A. more fossil fuels are being burned.
The more we burn fossil fuels (and that action happens more and more each day), the more we affect our surroundings and the atmosphere, which results in these unusual events such as acid precipitation. Acid rain is very detrimental to our planet, so we should try to save it while we still can.