Rotenone is a

Find the correct option with respect to bioherbicide.

Which insect helps to get rid of aphids?

Which of the following fungi is found useful in the biological control of plant diseases?

Which of the following is not the belief of an organic farmer?

Assertion $A$: The use of biocontrol agents prepared by microorganisms has become necessary as an alternative to chemical pesticides.
Reason $R$: The use of biological control agents helps maintain the balance of the ecosystem.
Which option is correct for Assertion $A$ and Reason $R$?