A significant economic sector that has grown rapidly in Sikkim in recent decades is:

Textile manufacturing
Information technology
Tourism
Heavy industry

The correct answer is: c) Tourism.

Sikkim is a small state in the eastern Himalayas. It is a popular tourist destination due to its beautiful scenery, including snow-capped mountains, lush forests, and cascading waterfalls. The state also has a rich cultural heritage, with a number of Buddhist monasteries and temples.

Tourism has been a major driver of economic growth in Sikkim in recent decades. The number of tourists visiting the state has increased significantly, and the tourism industry has created thousands of jobs. The government of Sikkim has been promoting tourism by developing infrastructure, such as roads and hotels, and by marketing the state to potential visitors.

Textile manufacturing, information technology, and heavy industry are not significant economic sectors in Sikkim. Textile manufacturing is a small industry in Sikkim, and it employs a relatively small number of people. Information technology is a growing industry in Sikkim, but it is still in its early stages of development. Heavy industry is not a significant economic sector in Sikkim.

In conclusion, the correct answer to the question “A significant economic sector that has grown rapidly in Sikkim in recent decades is:” is c) Tourism.