The best option from the list would be that "<span>C. It ties the essay together and tell readers what they have learned and should remember," since the other options have to do with the beginning and middle of the essay. </span>
It lies in the fact that the senior party to any relationship provided land and oversight to the junior party’s who in turn was expected to provide his lord with economic and military support.
I think that you just answered your own question in the question you asked.