industrial emissions from factories. coal that is burned to produce heat and power. automobile exhaust. nuclear power plants that produce radiation.
I gave my students this multiple choice question: Acid rain has a pH below 5.6. This rain can damage soil, lakes, crops, and buildings. Acid rain is caused by all of the following except

Only one answer is correct among these 4 choices:
- industrial emissions from factories.
- coal that is burned to produce heat and power.
- automobile exhaust.
- nuclear power plants that produce radiation.

Could you tell me which one is correct?

nuclear power plants that produce radiation.