The correct answer is: a) Barytes and limestone.
Barytes is a heavy, white mineral that is used in a variety of industrial applications, including the manufacture of paints, plastics, and paper. Limestone is a sedimentary rock that is composed primarily of calcium carbonate. It is used in a variety of construction applications, including the manufacture of cement and concrete.
The Rayalaseema region of Andhra Pradesh is located in the southern part of the state. It is a hilly region with a hot, dry climate. The region is known for its deposits of barytes and limestone. Barytes is mined in the Kurnool district, and limestone is mined in the Chittoor district.
The other options are incorrect. Mica is a mineral that is used in a variety of electrical and electronic applications. Uranium is a radioactive metal that is used in the production of nuclear energy. Copper is a metal that is used in a variety of construction and manufacturing applications. Gold is a precious metal that is used in jewelry and other decorative items.