The correct answer is: b) Limestone and coal.
The Eastern Ghats region of Andhra Pradesh is rich in limestone and coal. Limestone is a sedimentary rock that is formed from the accumulation of calcium carbonate. It is used in the manufacture of cement, lime, and other building materials. Coal is a fossil fuel that is formed from the remains of ancient plants. It is used in the generation of electricity and the production of steel.
The other options are incorrect. Bauxite is an ore of aluminum. Manganese is an ore of manganese. Iron ore is an ore of iron. Uranium is a radioactive element. Gold and diamonds are precious metals and gemstones.