Which of the following are true with regard to coal in India?
2. Coal is found in sedimentary rocks
3. The best quality of coal is lignite
4. The largest and oldest coalfield in India is known as the 'Ruhr of India'.
5. The Damodar river valley is popularly known as the Ruhr of India.
(a) I and IV
(b) I, II and III
(c) I, III and IV
(d) II, III and IV
