The correct answer is D. All of the above.
Barauni Thermal Power Station is a coal-fired thermal power station located in Barauni, Bihar, India. It is owned and operated by NTPC Limited. The power station has an installed capacity of 2,100 MW.
Kanti Thermal Power Station is a coal-fired thermal power station located in Kanti, Bihar, India. It is owned and operated by NTPC Limited. The power station has an installed capacity of 1,000 MW.
Barh Thermal Power Station is a coal-fired thermal power station located in Barh, Bihar, India. It is owned and operated by NTPC Limited. The power station has an installed capacity of 2,000 MW.
All three power stations are based on coal.