A:
Trees are heavily infested
B:
Location is highly polluted
C:
Location is moderately polluted
D:
Location is not polluted
Explanation
A location with luxuriant growth of lichens on the trees indicates that the location is not polluted (Option D).
Lichens are sensitive to air pollution, particularly sulfur dioxide and nitrogen dioxide, which are common pollutants. They require clean air to thrive and grow abundantly. When lichens are flourishing on trees, it suggests that the air quality is good and the location is not heavily polluted.
Therefore, the presence of luxuriant growth of lichens on trees indicates that the location is not polluted (Option D).
