The Magna Carta lead to the creation of the English Parliament, as well as the House of Commons and the House of Lords, if I recall correctly. Hope that helped.
Because plantation owners were mainly in the southern states. Also because there were many people that bought them from the south than anywhere else :)
Your answers are A, C, and D :) I just got this test done and these were the correct answers :) Just incase anyone says its false I have the screenshots lol :P