The correct answer is: A. Hisar
Hisar district is one of the most mineral-rich districts in Haryana. It has large reserves of limestone, dolomite, gypsum, and fireclay. The district is also home to a number of cement plants and other industries that use these minerals.
Limestone is a sedimentary rock that is composed mainly of calcium carbonate. It is used in a variety of industries, including construction, cement manufacturing, and steelmaking. Dolomite is a sedimentary rock that is composed of calcium magnesium carbonate. It is used in a variety of industries, including construction, cement manufacturing, and agriculture. Gypsum is a sedimentary rock that is composed of calcium sulfate dihydrate. It is used in a variety of industries, including construction, drywall manufacturing, and agriculture. Fireclay is a type of clay that is used in the manufacture of ceramics and refractories.
The mineral resources of Hisar district have played a significant role in the economic development of the district. The district is home to a number of industries that use these minerals, and the mining of these minerals has provided employment for a large number of people.
The other options are incorrect because they are not as mineral-rich as Hisar district. Kurukshetra district is known for its historical significance, Mahendragarh district is known for its agricultural production, and Yamunanagar district is known for its industrial development.