The correct answer is: All of the above.
Fertility rates are the average number of children that would be born to a woman over her lifetime if she were to experience the exact current age-specific fertility rates through her lifetime. Mortality rates are the probability of dying at a given age. Migration patterns are the movement of people from one place to another.
All of these factors can influence population growth. For example, if fertility rates are high, then the population will grow. If mortality rates are high, then the population will decline. And if migration patterns result in more people moving into a place than moving out, then the population will grow.
In the case of Manipur, the population has been growing rapidly in recent years. This is due to a number of factors, including high fertility rates, low mortality rates, and positive net migration.
Fertility rates in Manipur are among the highest in India. The average woman in Manipur has more than three children. This is due to a number of factors, including traditional cultural values that place a high value on having children, and the lack of access to family planning services.
Mortality rates in Manipur are also relatively low. The average life expectancy in Manipur is 67 years. This is due to a number of factors, including improvements in healthcare, and the relatively young age structure of the population.
Net migration in Manipur is positive. This means that more people are moving into Manipur than are moving out. This is due to a number of factors, including the relatively high economic growth rate in Manipur, and the availability of jobs.
The combination of high fertility rates, low mortality rates, and positive net migration has resulted in rapid population growth in Manipur.