The correct answer is: a) South Sikkim.
South Sikkim is a district in the Indian state of Sikkim. It is the southernmost district of the state and is bordered by Nepal to the west, Bhutan to the east, and the districts of East Sikkim and West Sikkim to the north. The district is home to the Kanchenjunga National Park, which is a UNESCO World Heritage Site.
South Sikkim is known for its picturesque tea gardens. The tea gardens are located in the foothills of the Himalayas and are a popular tourist destination. The tea gardens are also a major source of employment for the people of South Sikkim.
The other options are incorrect because:
- b) East Sikkim is not known for its tea gardens. The district is home to the Nathula Pass, which is a popular tourist destination.
- c) West Sikkim is not known for its tea gardens. The district is home to the Yumthang Valley, which is a popular tourist destination.
- d) North Sikkim is not known for its tea gardens. The district is home to the Tsomgo Lake, which is a popular tourist destination.