The correct answer is D. Mettur.
Barauni, Trombay, and Neyveli are all thermal power plants in India, while Mettur is a dam.
Barauni Thermal Power Plant is a coal-fired power plant located in Barauni, Bihar, India. It is the first thermal power plant in India to be built with Soviet assistance. The plant has an installed capacity of 2,100 MW.
Trombay Thermal Power Station is a coal-fired power plant located in Trombay, Mumbai, India. It is the largest thermal power plant in India with an installed capacity of 2,500 MW.
Neyveli Thermal Power Station is a coal-fired power plant located in Neyveli, Tamil Nadu, India. It is the second largest thermal power plant in India with an installed capacity of 2,400 MW.
Mettur Dam is a masonry dam on the Kaveri River in Tamil Nadu, India. It is the largest dam in India by volume and the second largest dam in India by height. The dam was built between 1934 and 1957 and is used for irrigation, drinking water supply, and hydroelectric power generation.