$RNA$ interference $(RNAi)$ is used to produce transgenic plants resistant to which of the following?

Bacillus thuringiensis forms protein crystals which contain a toxic insecticidal protein. This protein:

Which disease-resistant cotton variety is developed using genetic engineering methods?

$Gossypium$ $hirsutum$ is:

The bacterium $Bacillus$ $thuringiensis$ is widely used in modern biology as a/an:

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 :