The correct answer is: d) All of the above.
Ropar, Hoshiarpur, and Gurdaspur are all districts in Punjab that have limestone deposits. Limestone is a sedimentary rock composed mainly of calcium carbonate (CaCO3). It is a common rock type found in many parts of the world, and it is used in a variety of industries, including construction, manufacturing, and agriculture.
Limestone is formed when the remains of marine organisms, such as coral and shellfish, accumulate on the seafloor. Over time, these remains are buried and compacted, and they eventually turn into limestone. Limestone is a relatively soft rock, and it can be easily quarried and shaped. It is also a relatively strong rock, and it can be used to construct buildings, roads, and bridges.
Limestone is also used in the manufacturing of a variety of products, including cement, lime, and fertilizer. It is also used in the production of paper, glass, and ceramics. Limestone is an important resource, and it is used in a variety of industries around the world.