Introduction of genes coding for Bacillus thuringenesis insecticidal crystal protein confer resistance to

Answer: Option A

Introduction of genes coding for Bacillus thruringiensis insecticidal crystal protein confer resistance to Insects.
The toxic insecticidal proteins secreted by Bacillus thuringiensis kill the insect and not the bacteria itself because the Bt toxin proteins exist as an inactive proteins which become active due to the alkaline environment in the gut of insects and thus cause intestinal perforation and do not harm the bacteria itself.