Discussion
The serious insects/pests of lawns are:
Answer: A
The serious pests of lawns are ants, termites and root grubs, which feed on roots and damage the turf from below, and they are the key's answer.
Shoot borers, jassids and leaf rollers attack crops with leaves and shoots; mealy bugs and scales are minor; and red spider mites and sawflies are not main lawn pests.
Ants, termites and root grubs live in the soil and damage the roots of the grass, causing brown dead patches. This soil-living group is the one the question calls serious, while borers and leaf rollers are pests of crops with stems.
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