The correct answer is D. All of these.
Apple is mainly grown in the districts of Kinnaur, Mandi, and Shimla in Himachal Pradesh. Apple is the most important fruit crop of Himachal Pradesh. It is grown in an area of about 1.2 lakh hectares and accounts for about 90% of the total apple production in the country. The main apple-growing districts in Himachal Pradesh are Kinnaur, Mandi, Shimla, Kullu, and Sirmaur.
Kinnaur is the highest apple-growing district in the world. It is located in the eastern part of Himachal Pradesh and is known for its high-quality apples. The main apple varieties grown in Kinnaur are Golden Delicious, Red Delicious, and Granny Smith.
Mandi is another important apple-growing district in Himachal Pradesh. It is located in the central part of the state and is known for its delicious apples. The main apple varieties grown in Mandi are Royal Gala, Fuji, and Honeycrisp.
Shimla is the capital of Himachal Pradesh and is also an important apple-growing district. It is located in the western part of the state and is known for its beautiful apple orchards. The main apple varieties grown in Shimla are Gala, Fuji, and Granny Smith.
Kullu is another important apple-growing district in Himachal Pradesh. It is located in the northern part of the state and is known for its scenic beauty. The main apple varieties grown in Kullu are Golden Delicious, Red Delicious, and Granny Smith.
Sirmaur is the southernmost apple-growing district in Himachal Pradesh. It is located in the foothills of the Himalayas and is known for its mild climate. The main apple varieties grown in Sirmaur are Golden Delicious, Red Delicious, and Granny Smith.