The correct answer is C. Shimla.
The Shiwalik Hill agro-climatic zone is located in the northern part of the state of Himachal Pradesh. It is a hilly region with a temperate climate. The main crops grown in this zone are rice, wheat, maize, and barley. The main fruits grown in this zone are apples, pears, plums, and peaches.
The district of Shimla is located in the central part of the state of Himachal Pradesh. It is a hilly region with a temperate climate. The main crops grown in this district are rice, wheat, maize, and barley. The main fruits grown in this district are apples, pears, plums, and peaches. However, the district of Shimla is not covered by the Shiwalik Hill agro-climatic zone.
The districts of Una, Bilaspur, and Kangra are all located in the northern part of the state of Himachal Pradesh. They are all hilly regions with a temperate climate. The main crops grown in these districts are rice, wheat, maize, and barley. The main fruits grown in these districts are apples, pears, plums, and peaches. These districts are all covered by the Shiwalik Hill agro-climatic zone.