Lichens are best indicators of

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Water Pollution

Soil Pollution

Air pollution

Noise pollution

answer is C.

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Detailed Solution

Lichens stay in moist and dry places.
During rains, lichens turn into darker colors like black and inexperienced and start doing photosynthesis.
They may be dry, they seem dormant. Their color lightens and that they look faded and dull. For this reason, it may be said that lichens aren't signs of water pollution.
Soil is a essential stratum for lichens. It gives them vitamins, space to grow, moisture, and refuge, depending on the place.
lichens are sensitive to concentration of sulfur dioxide in the air.
Places with badly polluted air have a scarce population of lichens.
If they're found in abundance, it proves that the air is clean.
As a consequence, it has demonstrated that lichens are the quality indicators of air pollution considering the fact that they can’t live in areas with awareness of sulfur dioxide in air.

Hence, option C is the correct answer.

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