In-migration to Kerala is mainly from:

The correct answer is (b) Northeastern States.

In-migration to Kerala is mainly from the Northeastern States of India. This is due to a number of factors, including the following:

• The Northeastern States are relatively poor, and many people from these states migrate to Kerala in search of better economic opportunities.
• Kerala has a relatively high standard of living, and many people from the Northeastern States are attracted to this.
• Kerala has a relatively tolerant and welcoming culture, and many people from the Northeastern States feel comfortable living there.
• Kerala has a relatively large number of jobs available in the service sector, which is a major draw for people from the Northeastern States.

The other options are incorrect for the following reasons:

• Sri Lanka is a neighboring country of India, but there is not a significant amount of in-migration from Sri Lanka to Kerala.
• Bangladesh is another neighboring country of India, but there is also not a significant amount of in-migration from Bangladesh to Kerala.
• Uttar Pradesh is a state in India that is located in the northern part of the country. There is some in-migration from Uttar Pradesh to Kerala, but it is not as significant as the in-migration from the Northeastern States.