The correct answer is D. Darjeeling.
The Himalayan Mountaineering Institute (HMI) is an institute in Darjeeling, India, that trains mountaineers. It was founded in 1954 by Tenzing Norgay and Nehru. The institute offers courses in mountaineering, trekking, and other outdoor activities. It is one of the most prestigious mountaineering institutes in the world.
Dispur is the capital of Assam, India. It is located in the Brahmaputra Valley. Marmago is a village in the state of Goa, India. It is located on the banks of the Mandovi River. Dehradun is the capital of Uttarakhand, India. It is located in the foothills of the Himalayas.
All of the options are cities in India, but only Darjeeling is home to the Himalayan Mountaineering Institute.