In What Ways Was the Feudal System in Europe Different

In what ways was the feudal system in Europe different from the Roman Empire?

A) While there were many overlapping political authorities under feudalism, there was only a single government under the Roman Empire.
B) While the political authorities during the feudal period were not Christian, those during the Roman Empire were.
C) The feudal system was capitalist, while the Roman Empire was socialist.
D) During the Roman Empire citizenship was limited to Romans, while all people in the given territory were able to vote under feudalism.