The correct answer is: B. 1 and 2 only
Coal and iron ore are the two major minerals mined in Bihar. Coal is found in the Jharia and Raniganj coalfields, while iron ore is found in the Singhbhum and Keonjhar iron ore belts. Manganese and petroleum are not found in Bihar in significant quantities.
Coal is a fossil fuel that is formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years. It is a major source of energy in the world, and is used to generate electricity, power industrial processes, and heat homes and businesses.
Iron ore is a mineral that is used to make iron and steel. It is the most important raw material in the iron and steel industry, and is used to make a wide range of products, including cars, buildings, and machinery.
Manganese is a mineral that is used to make steel. It is a major alloying element in steel, and is used to improve the strength, toughness, and corrosion resistance of steel.
Petroleum is a fossil fuel that is formed from the remains of ancient plants and animals that have been buried and subjected to heat and pressure over millions of years. It is a major source of energy in the world, and is used to make gasoline, diesel fuel, and other petroleum products.