The correct answer is: Bauxite.
Bauxite is the most abundant mineral resource found in Karnataka. It is a type of ore that is used to produce aluminum. Bauxite is found in the districts of Bellary, Chitradurga, Tumkur, and Dharwad.
Coal is a type of fossil fuel that is used to generate electricity. It is found in the districts of Bellary, Chitradurga, and Tumkur.
Iron ore is a type of mineral that is used to produce iron and steel. It is found in the districts of Bellary, Chitradurga, and Tumkur.
Limestone is a type of rock that is used to produce cement. It is found in the districts of Bellary, Chitradurga, and Tumkur.
Bauxite is the most abundant mineral resource found in Karnataka because it is found in large deposits in the state. It is also a valuable resource because it is used to produce aluminum, which is a metal that is used in many different products.