Which one of the following is an example of carrying out biological control of pests or diseases using microbes?

  • A
    $Trichoderma$ $sp.$ against certain plant pathogens.
  • B
    $Nucleopolyhedrovirus$ against white rust in $Brassica$.
  • C
    $Bt$-cotton to increase cotton yield.
  • D
    Ladybird beetle against aphids in mustard.

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