Explanation

Bollgard I and Bollgard II are proprietary biotechnology trademarks developed by Monsanto (Bayer) for genetically modified (GM) insect-resistant cotton (Bt cotton):

– Bollgard I: Features a single gene, Cry1Ac, derived from the soil bacterium *Bacillus thuringiensis*, expressing an endotoxin toxic to the American bollworm.
– Bollgard II: Incorporates two genes, Cry1Ac and Cry2Ab, providing a dual-action crystalline protein mechanism that expands protection against pink bollworm and Spodoptera caterpillars while delaying the evolution of insect resistance.

Hence, they pertain to developing genetically modified crop plants — Option B.