Some reliable indicators of air pollutants (SO $_{2}$ and noxious gases) are

Lichens and mosses

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Ferns and Cycas

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Neem tree and Eichhornia

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Green algae and aquatic liverworts

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Solution

The correct option is C Lichens and mosses
Lichens and mosses are used as the indicators of air pollution. These structures grow on damp areas. Air pollutants which are in the gaseous forms get dissolved in the rainwater, especially SO $_{2}$ can damage these plants, and check them from growing. In places where these vegetation are not growing, it indicates that the air is heavily polluted with sulphur dioxide and other pollutants.
Thus, the correct answer is option A.

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