The correct answer is: B. 7000 million tonnes
Jharkhand is one of the largest producers of iron ore in India. The total deposits of iron ore in Jharkhand are estimated to be around 7000 million tonnes. The state has a number of iron ore mines, which are operated by both public and private sector companies. The iron ore produced in Jharkhand is used in the manufacture of steel.
Option A: 4600 million tonnes is incorrect. This is the estimated total deposits of iron ore in Odisha.
Option C: 3000 million tonnes is incorrect. This is the estimated total deposits of iron ore in Chhattisgarh.
Option D: 7500 million tonnes is incorrect. This is the estimated total deposits of iron ore in Karnataka.