What is the meaning of Bt in Bt cotton ?

1. A. Cotton seeds carrying and endotoxin gene from Bacillus thuringiensis against pink boll-worm
2. B. Baculovirus treated cotton seeds against pink boll-worm
3. C. Bigger thread of disease resistant cotton with better tensile strength.
4. D. Cotton produced by Biotechnology using restriction Enzyme and Ligases to resist microbial infection

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