The _left their home land to another country in the hope of securing a better future for their families.

Explanation

A. Emigrants are people who leave their homeland and go to another country. Option A is right.B. Immigrants are the people that are taken into a new country in the hope of securing a better future. B is wrong because when we talk about people who leave their homeland, they are emigrants, not immigrants.C. Migrants move from one place to another for a better person. It is not necessary for them to leave their homeland for another country. Hence Option C is wrong.D. Strollers are people taking a leisurely walk. Option D is totally wrong.