Select the correct statement regarding biocontrol agents. (A) Ladybird beetles and dragonflies a...

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Select the correct statement regarding biocontrol agents.
(A) Ladybird beetles and dragonflies are used to get rid of aphids and mosquitoes.
(B) Bacillus thuringiensis bacteria are used to control butterfly caterpillars.
(C) Trichoderma sp. are used to control several plant pathogens.
(D) All of these
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