The correct answer is (c) Jharia.
Jharia is the largest coalfield in India, located in the state of Jharkhand. It is estimated to contain about 30 billion tonnes of coal, making it one of the largest coal reserves in the world. The coalfield is also one of the oldest in India, with mining operations dating back to the 18th century.
The Jharia coalfield is a major source of coal for India’s power plants and steel mills. However, the coalfield is also a major source of pollution and environmental problems. The coal seams in Jharia are highly gassy, and there have been a number of mine fires and explosions in the past. The coalfield is also located in a seismically active area, and there have been a number of earthquakes in the past that have caused damage to the mines.
Despite the environmental problems, the Jharia coalfield is an important economic asset for India. The coalfield provides employment for thousands of people, and it is a major source of revenue for the government. The government is working to develop new technologies to extract coal from the Jharia coalfield safely and without causing environmental damage.
The other options are:
(a) Raniganj: Raniganj is a coalfield located in the state of West Bengal. It is the second largest coalfield in India, after Jharia. The Raniganj coalfield is estimated to contain about 15 billion tonnes of coal.
(b) Bokaro: Bokaro is a coalfield located in the state of Jharkhand. It is the third largest coalfield in India, after Jharia and Raniganj. The Bokaro coalfield is estimated to contain about 10 billion tonnes of coal.
(d) Giridih: Giridih is a coalfield located in the state of Jharkhand. It is the fourth largest coalfield in India, after Jharia, Raniganj, and Bokaro. The Giridih coalfield is estimated to contain about 5 billion tonnes of coal.