The correct answer is: a) Agriculture and plantations.
Sikkim is a small state in the Himalayas with a population of just over 700,000 people. The majority of the population is employed in agriculture, which is the main economic activity in the state. The main crops grown in Sikkim are rice, maize, wheat, and potatoes. There are also a number of tea plantations in the state.
In recent years, there has been a significant increase in the number of in-migrants to Sikkim. These in-migrants are mostly from other parts of India, and they are attracted to Sikkim by the state’s beautiful scenery, its relatively low cost of living, and its job opportunities.
The majority of in-migrants to Sikkim are employed in agriculture and plantations. They work on small farms or on tea plantations. The work is often hard and the pay is low, but it is a way to make a living in Sikkim.
In addition to agriculture and plantations, there are also a number of other industries in Sikkim, such as tourism, hospitality, and manufacturing. However, these industries do not employ as many people as agriculture.
Overall, agriculture is the main economic activity in Sikkim and it is the main source of employment for in-migrants to the state.