The famous hill station of Mussoorie is located in a neighboring state of Himachal Pradesh.

Which state? Uttarakhand
Jammu & Kashmir
Uttar Pradesh
Punjab

The correct answer is Uttarakhand.

Mussoorie is a hill station in the Garhwal Himalayas in the Indian state of Uttarakhand. It is located in the foothills of the Himalayas, about 300 kilometers (190 mi) north of New Delhi. Mussoorie is a popular tourist destination, known for its scenic views, colonial architecture, and pleasant climate.

The other options are incorrect. Jammu and Kashmir is a state in northern India. Uttar Pradesh is a state in northern India. Punjab is a state in northwestern India.