The correct answer is C. Kangra.
Rock salt is a sedimentary rock composed of halite, a mineral form of sodium chloride. It is the most common salt in the world and is used for a variety of purposes, including food, water purification, and de-icing.
Rock salt is found in many parts of the world, but it is most abundant in the following districts:
- Kangra district in Himachal Pradesh, India
- Kutch district in Gujarat, India
- Sambhar Salt Lake in Rajasthan, India
- Great Salt Lake in Utah, USA
- Dead Sea in Israel and Jordan
The rock salt deposits in Kangra district are the largest in India. They are located in the Dhauladhar range of the Himalayas and are estimated to be over 100 million years old. The salt is mined from open-pit mines and is then transported to processing plants where it is crushed, ground, and refined.
The rock salt from Kangra district is of high quality and is used in a variety of industries, including food, pharmaceuticals, and chemicals. It is also exported to many countries around the world.
The other options are incorrect because they are not districts where rock salt is mostly found.