The correct answer is: C. Kangra
Kangra district has the maximum number of industrial units in Himachal Pradesh. It is followed by Hamirpur, Solan, and Kullu districts.
Kangra district is located in the central part of Himachal Pradesh. It is the largest district in the state in terms of area. The district is home to a number of industrial units, including textile mills, paper mills, and sugar mills.
Hamirpur district is located in the southern part of Himachal Pradesh. It is the second largest district in the state in terms of area. The district is home to a number of industrial units, including cement factories, steel plants, and power plants.
Solan district is located in the northern part of Himachal Pradesh. It is the third largest district in the state in terms of area. The district is home to a number of industrial units, including pharmaceutical companies, electronics companies, and automobile companies.
Kullu district is located in the eastern part of Himachal Pradesh. It is the smallest district in the state in terms of area. The district is home to a number of industrial units, including tourism-related industries, such as hotels and restaurants.