The correct answer is chromite. Chromite is a mineral that is found in Manipur. It is a black ore that is used to make chromium. Chromium is a metal that is used to make stainless steel and other alloys. It is also used to make pigments for paints and dyes.
Limestone is a sedimentary rock that is made up of calcium carbonate. It is a white or gray rock that is used to make cement and other building materials.
Copper is a metal that is found in nature. It is a red or reddish-brown metal that is used to make wires, pipes, and other products.
Manganese is a metal that is found in nature. It is a gray or black metal that is used to make batteries and other products.
Chromite is the only mineral that is found in Manipur. The other minerals are not found in Manipur.