The answer could probably be c
1) The word "vassal" was mostly used for the knights who were responsible for providing the military defense for the king - the answer is "perform military service"
2) Magna Carta is known as the first document to limit the power of the king ! (3rd option)
3) this was the Holy Roman Empire, which was actually an association of independent states.
<span>Choice (a) is correct. To make an amendment to the Articles, all 13 states had to agree. This made amendments particularly difficult: any one state could derail the entire process. This is why the Articles failed after such a short time, to be replaced by the current Constitution.</span>
Um so the plentiful harvest one helped with the ancient civilizations ability to have large populations cause of the food and the need materials to live