Consider this example :
‘Rajesh left India and settled in the U.S.A. after getting a post-graduation degree from a University in U.S.A". While teaching the theme ‘Migration’ this example could be used to discuss :

Correct option is C

Pull factor and Emigration.
The example of Rajesh leaving India to settle in the U.S.A. after getting a post-graduation degree illustrates pull factors and emigration.
 Pull factors refer to the attractive aspects of a destination country that motivate people to migrate there. In this case, the pull factors for Rajesh include the opportunity to pursue higher education in the U.S.A., the potential for better job prospects and higher salaries, and the prospect of living in a developed country with a higher standard of living.
 Emigration refers to the movement of people out of their country of origin to settle in another country. In this case, Rajesh is emigrating from India to the U.S.A.