<span>They provided protection to all in
exchange for land and labor.</span> <span>About the
hierarchy at the manor where most of the people were serfs and received land in
exchange for farm labor and other jobs (like blacksmith, stone masons and
baker). </span>
D is the answer, because all of the above are true. All of the answers make since.
Insufficient information.
I have no clue you should ask Google
