The correct answer is: c) Kachchh.
China clay, also known as kaolin, is a fine, white clay that is used in a variety of industries, including ceramics, papermaking, and cosmetics. It is found in many parts of the world, including Gujarat, India.
The Kachchh district of Gujarat is one of the major producers of china clay in India. The clay is found in the Rann of Kachchh, a vast salt marsh that covers much of the district. The clay is mined from open-pit mines and then processed to remove impurities.
China clay from Kachchh is known for its high quality and purity. It is used in a variety of products, including ceramics, paper, and cosmetics. The clay is also exported to other countries.
The other options are incorrect. Panchmahal, Sabarkantha, and Banaskantha are all districts in Gujarat, but they are not major producers of china clay.