In theory, feudalism was based on cooperation and support. Which phrase best describes feudalism in practice?

A.
strictly enforced code of chivalry

B.
unlimited rule by a few powerful monarchs

C.
frequent warfare among landowners

D.
economic ties between manors and towns
(last question of this was on wrong subject accidentally, i've been up for around 24 hours since yesterday at 10:00 am. sorry! <3)