The correct answer is: B. 303 crore tonnes.
Coal is a fossil fuel formed from the remains of ancient plants and animals that have been buried and subjected to intense heat and pressure over millions of years. It is a non-renewable resource, meaning that it cannot be replaced once it is used up.
Bihar is one of the major coal-producing states in India. The estimated coal reserves in Bihar are 303 crore tonnes. These reserves are located in the Jharia coalfield, which is the largest coalfield in India. The Jharia coalfield is located in the eastern part of Bihar, and it covers an area of about 2,000 square kilometers.
The coal in the Jharia coalfield is of high quality, and it is used to generate electricity, produce steel, and make other products. The coalfield is also a major source of employment for people in Bihar.
The coal reserves in Bihar are a valuable resource, and they need to be managed carefully. The government of Bihar has taken steps to ensure that the coal reserves are exploited in a sustainable manner.
The other options are incorrect. Option A is incorrect because the estimated coal reserves in Bihar are 303 crore tonnes, not 1260 crore tonnes. Option C is incorrect because the estimated coal reserves in Bihar are 303 crore tonnes, not 25310 crore tonnes. Option D is incorrect because the estimated coal reserves in Bihar are 303 crore tonnes, not 16 crore tonnes.