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a
Na3AsO3 and NaClO3 are herbicides
b
Corn fields where herbicides are commonly used are prone to attack of insects
c
No insecticide or herbicide is ecofriendly
d
All of the above are correct
answer is D.
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Detailed Solution
Na3AsO3 and NaClO3 are herbicides, Corn fields where herbicides are commonly used are prone to attack of insects and no insecticide or herbicide is ecofriendly.