PLS HLLLPP!! thanks! :) President Lincoln issued the Emancipation Proclamation after

A: The Union's effectiveness at the battle of Antietam
B: The death of general Jackson at Chancellorsville
C: The nation had voted to decide the issue of slavery
D: The capture of Washington, DC, by Confederate forces

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.