Explanation: Steel production is a complex process that requires several raw materials, with coal being one of the most critical. Coal serves two primary functions in steel production: it is used as a fuel to generate the high temperatures needed in the blast furnace, and it acts as a reducing agent to remove oxygen from iron ore, converting it into metallic iron.
West Bengal and Ranijang are significant coal-producing regions in India. The coal deposits in these areas are of high quality and are particularly suitable for the steel industry. Tata Steel, one of the largest steel producers in India, has a substantial presence in these regions and relies heavily on the coal supplied from these areas to fuel its steel-making processes.
Iron ore is another essential raw material for steel production, but the question specifically asks about the raw material provided by West Bengal and Ranijang to Tata Steel. While West Bengal does have iron ore deposits, the primary contribution from these regions to Tata Steel is coal. The coal from these areas is crucial for the energy-intensive process of steel production, making it the correct answer.
Water and power are important for the operation of steel plants, but they are not considered raw materials in the context of steel manufacturing. Water is used in various cooling and cleaning processes, and power is necessary to run the machinery and equipment. However, these are not the raw materials that directly contribute to the production of steel.
In summary, the correct answer is coal because it is the primary raw material supplied by West Bengal and Ranijang to Tata Steel, playing a crucial role in the steel-making process. Understanding the specific roles of different materials in industrial processes is essential for comprehending the economic and industrial significance of regions like West Bengal and Ranijang in the context of India's steel industry.