Please help me with this

Who wanted to make drastic changes in society? a.radical b.patriot c.traitor d.independence e.loyalist

Which of the following is an example of the pull factor known as economic migration? a. better educational opportunities pulling people towards a new country b. mexican laborers entering the us to work in agricultural jobs c. joining family members that are already in a new country d. crop failures driving people away from their country i am unsure on this question, i was thinking b? but i could be wrong.

What is the difference between an independent and a dependent variable?