Q: Nitrogen and sulfur oxides form what type of rain?


Read this paragraph and choose the correct option from the provided answers:

Both nitrogen and sulfur oxides are toxic to humans. These compounds can cause lung diseases or make them worse. Nitrogen and sulfur oxides form acid rain, which is described in the next concept.

 Choices:

- common rain

- toxic rain

- heavy rain

- acid rain


A:
acid rain