What factors encouraged commercial growth in the post-classical era?

Sole i will mark brainlist to who answer

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.

Which asian nation's constitution has over 40 articles devoted to protecting the rights and civil liberties of its citizens? a) china b) india c) japan d) korea