The correct answer is: All of the above.
In-migration to Himachal Pradesh from other states is mainly driven by employment opportunities, educational prospects, and better living standards.
Employment opportunities: Himachal Pradesh has a growing economy and is a major tourist destination. This has led to an increase in the demand for labor, which has attracted migrants from other states.
Educational prospects: Himachal Pradesh has a number of good schools and universities. This has made it a popular destination for students from other states who are looking for a quality education.
Better living standards: Himachal Pradesh is a beautiful state with a clean environment and a low cost of living. This has made it an attractive destination for people who are looking for a better quality of life.
In addition to these factors, Himachal Pradesh is also a relatively safe and peaceful state. This has made it a popular destination for people who are looking to escape the violence and crime that is prevalent in other parts of India.