Which of the following countries is a fictional place, created by the English novelist James Hilton?

Shangri-La is a fictional place described in the 1933 novel "Lost Horizon" by British author James Hilton. Hilton describes Shangri-La as a mystical, harmonious valley, gently guided from a lamasery, enclosed in the western end of the Kunlun Mountains. Shangri-La has become synonymous with any earthly paradise, particularly a mythical Himalayan utopia – a permanently happy land, isolated from the world. In the novel, the people who live at Shangri-La are almost immortal, living hundreds of years beyond the normal lifespan and only very slowly aging in appearance. The name also evokes the imagery of the exoticism of the Orient.