What is a push/pull factor?

Select one:

the way we open the gates on the borders

how immigrants are forced to move

the deciding agents in what causes immigrants to move the factors that decide if an immigrant will be deported

Push Factor "push" people away from there homes and include things like war, so they make people leave there homes because for e. x war.

Pull Factor "pull" people to a new home that include things like better opportunities.

Explanation:

I think the best answer would be the deciding agents in what causes immigrants to move.

Like for e. x high unemployment is a common push factor, while plenty of jobs is a pull factor.