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B
Contact poison
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C
Fumigant
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D
Biological control
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Solution
The correct option is D Fumigant Fumigants are volatile and poisonous substances used to kill insects, nematodes that damage stored foods or seeds, human dwellings, clothing, and nursery stock. Ethylene dichloride is used to treat open storage areas and as soil fumigants. It is a low-pressure compound which diffuses more slowly.