The correct answer is option 3 - Both 1 and 2. Nagpur is promoted as the tiger capital of the world because it satisfies both criteria mentioned in the options.

Option 1 states that Nagpur is the major storehouse of tigers as the districts adjacent to Nagpur have many tiger reserves and sanctuaries. This means that Nagpur and its surrounding areas have a significant concentration of tiger habitats and conservation areas, making it an ideal location for tiger spotting and conservation efforts.

Option 2 states that Nagpur has infrastructure that can support a large tourist industry. This means that Nagpur has the necessary facilities and amenities to cater to a large number of tourists who visit the region for tiger tourism. This includes hotels, transportation, guides, and other tourist services.

By satisfying both criteria, Nagpur is able to position itself as the tiger capital of the world and attract tourists who are interested in tiger conservation and wildlife tourism. It offers both a rich natural environment for tiger conservation and the necessary infrastructure for a comfortable and enjoyable tourist experience.