The correct answer is: b) In-migration.
The Inner Line Permit (ILP) system in Nagaland regulates in-migration. It is a document that is required by Indian citizens to enter the state of Nagaland. The ILP system was introduced in 1873 to protect the interests of the indigenous people of Nagaland from the influx of outsiders. The ILP system is currently regulated by the Nagaland ILP Act, 1970.
The ILP system has been criticized by some people for being discriminatory against non-Nagas. However, the Nagaland government has defended the ILP system, saying that it is necessary to protect the culture and identity of the indigenous people of Nagaland.
The following are the options of the question and a brief explanation of each:
a) Out-migration: Out-migration is the movement of people out of a country or region. The ILP system does not regulate out-migration.
b) In-migration: In-migration is the movement of people into a country or region. The ILP system regulates in-migration.
c) Inter-district migration: Inter-district migration is the movement of people between districts within a country. The ILP system does not regulate inter-district migration.
d) International migration: International migration is the movement of people between countries. The ILP system does not regulate international migration.