The correct answer is: a) Rural to urban migration.
Mizoram is a state in northeastern India. It is the second least populous state in India, with a population of just over 1.1 million people. The majority of the population of Mizoram is rural, with only about 20% of the population living in urban areas. However, in recent years, there has been a significant increase in rural to urban migration in Mizoram. This is due to a number of factors, including the lack of economic opportunities in rural areas, the desire for better education and healthcare, and the pull of urban centers like Aizawl and Lunglei.
The large-scale influx of people from other states is not a major pattern of migration in Mizoram. The state has a relatively small population, and the majority of the population is indigenous to Mizoram. There is some migration from other states, but it is not on a large scale.
Significant emigration to foreign countries is also not a major pattern of migration in Mizoram. There is some emigration, but it is not on a large scale. The majority of the population of Mizoram remains in the state.
Seasonal migration of nomadic tribes is not a major pattern of migration in Mizoram. There are some nomadic tribes in Mizoram, but they are a small minority of the population. The majority of the population of Mizoram is not nomadic.