The correct answer is: a) Dalhousie.
Dalhousie is a hill station in the Chamba district of Himachal Pradesh, India. It is located in the Shivalik Hills, a sub-range of the Himalayas. The town is named after Lord Dalhousie, who was the Governor-General of India from 1848 to 1856.
Dalhousie is a popular tourist destination, known for its scenic beauty, colonial architecture, and pleasant climate. The town is surrounded by hills and forests, and there are several hiking trails in the area. Dalhousie also has a number of historical buildings, including the Dalhousie Castle, the Viceregal Lodge, and the Christ Church.
The other options are incorrect because they are not located in the Shivalik Hills. Kasauli is a hill station in the Solan district of Himachal Pradesh. Shimla is the capital of Himachal Pradesh and is located in the Himalayas. Nainital is a hill station in the Kumaon region of Uttarakhand.