What is migration?

O A. The use of machines to make travel easier

O B. Using trains to carry trade goods from place to place

O C. The movement of products from one place to another

O D. The movement of people from one place to another

It's letter d; the movement of people from one place to another

D

Explanation:

Human migration is the movement of people from one place to another with the intentions of settling, permanently or temporarily, at a new location. The movement is often over long distances and from one country to another, but internal migration is also possible; indeed, this is the dominant form globally.