Which of the following statements are true with respect to iron ore? 1. Limestone and coal are important for smelting iron ore. 2. More than 20 per cent iron ore deposits of the world are in India. 3. Odisha and Bihar top in the production of iron ore. 4. Iran is the largest, buyer of Indian iron ore. Select the correct answer using the code given below:

• A.  1, 2 and 3                    
• B.  2 and 3
• C.  3 and 4                       
• D.  2, 3 and 4