Question

Who became land owners in exchange for services in the feudal system?

A. fiefs
B. serfs
C. vassals
D. knights

Answer 1

(c) vassals I am sure

Answer 2

Let's look at the possible answers here.

A. Fiefs  -  A fief is a piece of land, so no.

B. Serfs - No, serfs were like Medieval slaves

C. Vassals - These were vassals under a king, like lords. So yes, this could be it.

D. Knights - Although they too sometimes were land owners, vassals were more known to own and operate land,

This is a tricky question and could go either way, but I would say vassals.

C