The correct answer is: A. China clay (Kaolinite).
China clay is a fine, white clay that is used in a variety of products, including ceramics, paper, and paint. It is found in deposits around the world, including in Bhagalpur, Munger, Banka, and Vaishali in India.
Fire clay is a type of clay that is used in the manufacture of ceramics and other products that need to withstand high temperatures. It is found in deposits around the world, but not in Bhagalpur, Munger, Banka, and Vaishali.
Mica is a mineral that is used in a variety of products, including electrical insulation, roofing, and cosmetics. It is found in deposits around the world, but not in Bhagalpur, Munger, Banka, and Vaishali.