Correct choice is (a) Coal
For explanation I would say: Coal is the most abundantly available fossil fuel in India. There are different forms of coal available they are, 1) Peat: Peat is produced by the decaying of plants in swamps. 2) Bituminous: It derives its name after liquid called bitumen. 3) Lignite: This form is used to produce electricity. 4) Anthracite: It has more than 90% carbon content per kg and it is the best quality coal.