Nuclear energy contributes approximately 2-3% to India's total electricity generation, making option D correct. India operates 22 nuclear reactors with a total capacity of about 6,780 MW. The majority of India's power comes from coal (around 70%), followed by renewables, hydro, and gas. The government has plans to increase nuclear capacity to 22,480 MW by 2031, but it will remain a small portion of the total energy mix.