The correct answer is C. Both (A) and (B).
Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is the most common sedimentary rock in the world, and it is used in a variety of industries, including the cement, construction, and chemical industries.
In the cement industry, limestone is used as a raw material in the production of Portland cement. Portland cement is a hydraulic cement, which means that it sets and hardens under water. It is the most common type of cement used in construction.
In the construction industry, limestone is used as a building material. It is used to make concrete, bricks, and other building products. Limestone is also used as a decorative stone in buildings and monuments.
In the chemical industry, limestone is used to produce lime, which is a white powder that is used in a variety of applications, including water treatment, papermaking, and agriculture.
Limestone is a valuable resource that is used in a variety of industries. It is a non-renewable resource, and it is important to use it wisely.