The correct option is
B National Thermal Power Corporation
NTPC is a major power providing corporation in India The corporation has a pro-active approach for preserving the natural environment and resources like water, oil and gas and fuels in places where it is setting up power plants. This has been possible through
(a) Optimum utilisation of equipment adopting latest techniques and upgrading existing equipment.
(b) Minimising waste generation by maximising ash utilisation.
(c) Providing green belts for nurturing ecological balance and addressing the question of special purpose vehicles for afforestation.