Which of the following situations is an example of external migration?
Amoving from Canada to the United States
Bmoving from California to Florida
Cmoving to a town a few miles away
Dmoving to a new house down the street
Amoving from Canada to the United States
Bmoving from California to Florida
Cmoving to a town a few miles away
Dmoving to a new house down the street