(C) The correct answer is $C$. Ladybirds (beetles with red and black markings) are well-known biological control agents that feed on aphids. They are

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(C) The correct answer is $C$. Ladybirds (beetles with red and black markings) are well-known biological control agents that feed on aphids. They are used in agriculture to naturally control aphid populations,which are pests that damage crops by sucking plant sap.