The correct answer is: a) Limestone.
Andhra Pradesh is a leading producer of limestone in India. Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is the most abundant sedimentary rock in the world and is used in a variety of industries, including construction, cement manufacturing, and iron and steel production.
Iron ore is a mineral that is used to make iron and steel. It is the most important mineral in the world and is found in a variety of countries, including India. Iron ore is mined in Andhra Pradesh, but the state is not a major producer of this mineral.
Manganese is a mineral that is used to make steel. It is found in a variety of countries, including India. Manganese is mined in Andhra Pradesh, but the state is not a major producer of this mineral.
Granite is a type of igneous rock that is composed of quartz, feldspar, and mica. It is used in a variety of construction projects, including buildings, bridges, and roads. Granite is found in Andhra Pradesh, but the state is not a major producer of this mineral.