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 in Manipur. For example, if fertility rates increase, the population will grow. If mortality rates decrease, the population will also grow. And if migration patterns cause more people to move into Manipur than move out, the population will grow.
In addition to these factors, population growth can also be influenced by other factors such as the age structure of the population, the level of education, and the availability of healthcare.