Explanation:

4th option is correct.
The Largest city (areawise) of Himachal Pradesh is Shimla.
Shimla is the capital of the northern Indian state of Himachal Pradesh, in the Himalayan foothills. Once the summer capital of British India, it remains the terminus of the narrow-gauge Kalka-Shimla Railway, completed in 1903. It’s also known for the handicraft shops that line The Mall, a pedestrian avenue, as well as the Lakkar Bazaar, a market specializing in wooden toys and crafts.