$Bt$ cotton is used to destroy:

Which of the following statements is correct regarding $Bt$ toxin?

What is the main characteristic observed in $BT$ cotton?

Which of the following is $NOT$ harmed by $Bt$ toxin?

The characteristic of $Bt$ cotton is $..........$

Given below are $2$ statements: one is labelled as Assertion $(A)$ and other is labelled as Reason $(R)$.
Assertion $(A) :-$ Toxic insecticidal protein of Bacillus thuringiensis does not kill Bacillus itself.
Reason $(R) :-$ In Bacillus,$Bt$ toxin protein exists as inactive protoxins.
Correct answer from the options given below :