The correct answer is option 2: Maize, soybean, and cotton.

Genetically modified (GM) varieties or hybrids are now being widely cultivated in the world. These crops have undergone genetic modifications in laboratories to enhance their desirable traits, such as resistance to pests, diseases, or herbicides, and improved yield.

Option 1 (Wheat, coconut, and mango) is incorrect because wheat, coconut, and mango are not commonly genetically modified crops. Although there have been attempts to develop GM varieties of wheat, they are not yet widely cultivated on a large scale. Similarly, coconut and mango are not typically genetically modified.

Option 3 (Gram, brinjal, and orange) is also incorrect. While there have been experiments with genetically modified gram (chickpea) and brinjal (eggplant), they are not widely cultivated globally. Orange is not genetically modified.

Option 4 (Olive, mustard, and groundnut) is incorrect. None of these crops are widely cultivated as genetically modified varieties.

In summary, the correct answer is option 2: Maize, soybean, and cotton, as these crops have widely adopted genetically modified varieties or hybrids.