Serfs differed from slaves in that
(A) serfs were largely commercialized artisans while slaves were agricultural.
(B) serfs were ethnically Europeans while slaves were Muslims, pagans, and Africans.
(C) they could not be bought or sold, and owned some of the land they farmed.
(D) serfs could serve in the military, while slaves could not.
(E) slaves frequently were better educated and lived in towns.
Answer: C