The correct answer is: a) Rural to urban areas.
Sikkim is a state in northeastern India. It is the second-smallest state in India by area, after Goa. The capital of Sikkim is Gangtok.
Sikkim is a mountainous state with a population of about 610,000 people. The majority of the population lives in rural areas. However, there has been a trend of migration from rural to urban areas in recent years.
There are several reasons for this trend. One reason is that there are more job opportunities in urban areas. Another reason is that urban areas have better infrastructure, such as schools, hospitals, and transportation.
The migration from rural to urban areas has had a number of effects on Sikkim. One effect is that the population of urban areas has increased, which has put a strain on resources such as water and electricity. Another effect is that the traditional way of life in rural areas has been disrupted.
The government of Sikkim is trying to address the challenges of migration. One way is by providing more job opportunities in rural areas. Another way is by improving the infrastructure in rural areas.
Option b) Urban to rural areas is incorrect because there is a trend of migration from rural to urban areas in Sikkim.
Option c) North Sikkim to South Sikkim is incorrect because there is no evidence to suggest that there is a trend of migration from North Sikkim to South Sikkim.
Option d) High altitudes to lower altitudes is incorrect because there is no evidence to suggest that there is a trend of migration from high altitudes to lower altitudes in Sikkim.