The correct answer is: a) Protecting indigenous land rights.
The Inner Line Permit System is a system of restricted travel to certain areas in India. It is designed to protect the indigenous peoples of these areas from the negative effects of outside influence, such as migration, deforestation, and pollution.
The Meitei people are the indigenous people of Manipur, a state in northeastern India. They have been protesting for the implementation of the Inner Line Permit System in Manipur for many years. They believe that the system will help to protect their land and culture from the negative effects of outside influence.
The other options are incorrect because they do not focus on protecting indigenous land rights. Option b) is about restricting migration, but it does not mention protecting indigenous land rights. Option c) is about promoting Meitei language, but it does not mention protecting indigenous land rights. Option d) is about demanding greater autonomy, but it does not mention protecting indigenous land rights.