Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

Forests generally improve air quality by absorbing carbon dioxide and trapping dust and pollutants on their leaves.

The Assertion is correct about this air-cleaning role of forests.

The Reason is also correct because some tree species emit volatile organic compounds such as isoprene that can help form ground-level ozone.

This ozone-forming effect is a drawback of certain trees, so it cannot explain why forests improve air quality.

The two statements describe opposite influences of trees on the atmosphere, hence one does not explain the other.

Overall the pollutant-removing benefits of forests usually outweigh their isoprene emissions.