The correct answer is: c) Coal and iron ore
Bihar is a state in eastern India. It is the third-largest state in India by population, after Uttar Pradesh and Maharashtra. Bihar is also the 13th-largest state in India by area.
Bihar has limited mineral resources, but some deposits exist of coal and iron ore. Coal is the most important mineral resource in Bihar. The state has the second-largest coal reserves in India, after Jharkhand. The coal reserves in Bihar are estimated to be about 90 billion tonnes.
Iron ore is another important mineral resource in Bihar. The state has the third-largest iron ore reserves in India, after Odisha and Chhattisgarh. The iron ore reserves in Bihar are estimated to be about 2.5 billion tonnes.
The other options are incorrect because:
- Limestone and mica are not important mineral resources in Bihar.
- Gold and diamonds are not found in Bihar.
- Copper and zinc are not found in Bihar.