The correct answer is: a) Labor migration.
Labor migration is the movement of people from one country to another in order to find work. It is often seasonal and temporary, as workers may move to a different country for a few months or a year to work in a specific industry, such as agriculture or construction. Labor migration can be driven by a number of factors, including economic opportunity, political instability, and natural disasters.
Skilled migration is the movement of people from one country to another in order to take up a job that requires a high level of skill. This type of migration is often permanent, as skilled workers are typically in high demand and can command high salaries. Skilled migration can be driven by a number of factors, including economic opportunity, family reunification, and political asylum.
Refugee migration is the movement of people from one country to another due to war, persecution, or natural disaster. Refugees are typically granted asylum in the country they flee to, and they are often given temporary or permanent residency status. Refugee migration can be a very traumatic experience, as refugees often have to leave their homes and families behind.
Family migration is the movement of people from one country to another to join their family members. This type of migration is often permanent, as family members are typically reunited in the new country. Family migration can be driven by a number of factors, including economic opportunity, family reunification, and political asylum.
In the case of Assam, labor migration is the most common type of migration. This is due to the fact that Assam is a major agricultural state, and there is a high demand for labor in the agricultural sector. Labor migrants from other parts of India often move to Assam to work in the fields during the harvest season.