Which of the following is a definition for manorialism? a) a ceremony in which the vassal declares his loyalty to his lord and receives his fief b) a social and economic system in the middle ages based more in the monetary agreements of goods and services c) a social, economic and political system in the middle ages in which vassals gave military service in return for land and protection from a lord d)a manorial land held by the lord, attached to the manor house and not held by serfs or freemen