The correct answer is C. Kotgarh.
Kotgarh is a town in Shimla district of Himachal Pradesh, India. It is located in the lower Himalayas, at an altitude of 2,000 meters (6,600 feet). The town is known for its apple orchards, and is often called the “apple heartland of Himachal Pradesh”.
The first apple seeds were sown in Kotgarh in the 18th century by a British officer named Captain Robert Bruce. The seeds were brought from England, and they grew into apple trees that produced delicious apples. The apples from Kotgarh soon became famous, and people from all over India came to buy them.
Today, Kotgarh is a major apple-producing region in India. The town has a population of about 10,000 people, and most of the residents are involved in the apple industry. The town is also a popular tourist destination, and many people come to visit the apple orchards and enjoy the beautiful scenery.
The other options are incorrect because they are not apple-producing regions. Rampur is a town in the Una district of Himachal Pradesh, Nadaun is a town in the Hamirpur district of Himachal Pradesh, and Arki is a town in the Solan district of Himachal Pradesh.