Which Is a Good Example of Return Migration

Which is a good example of return migration?

A) Joon Park, an American, goes to Korea for the summer to visit the village of his ancestors.
B) When India was partitioned in 1947, the Pradesh family moved from India to the newly formed country of West Pakistan, a place they had never been before.
C) When John Wallace retired from his job in Chicago, he and his sister Etta sold their home and moved back to England to spend their final years in the land of their youth.
D) Nam Vo came to California as one of the "boat people." He is planning a second move from Los Angeles to Detroit to live with his cousin.