The correct answer is: d) All of the above.
Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is the most common sedimentary rock on Earth, and it is used in a variety of industries, including cement production, iron and steel production, and construction.
Cement is a binding agent that is used to hold together aggregates (sand, gravel, and crushed stone) to form concrete. Limestone is one of the main ingredients in cement, and it is used to provide strength and durability to concrete.
Iron and steel are two of the most important metals in the world, and they are used in a variety of products, including cars, buildings, and machinery. Limestone is used in the production of iron and steel, and it is used to remove impurities from iron ore.
Construction is a major industry in Arunachal Pradesh, and limestone is used in a variety of construction materials, including bricks, tiles, and concrete. Limestone is also used in the construction of roads, bridges, and dams.
In conclusion, limestone deposits in Arunachal Pradesh are important for a variety of industries, including cement production, iron and steel production, and construction.