Your question is incomplete because it lacks the options to choose from, which are:
The manor had everything needed to live, and was surrounded by those sworn to protect it.
A manor was surrounded by high walls and was impossible to invade.
The lord became so powerful that invaders dared not approach his manor.
Invaders wanted to settle unoccupied farmland and had no interest in attacking manors.
Answer:
The manor had everything needed to live, and was surrounded by those sworn to protect it.
Explanation:
The system of feudalism began during the period of Viking, Magyar and Muslim invasions, and involved a production and dependence relationship betwen the lord and his peasants, who lived under the lord's rule within his manor. Thus, peasants gave up their freedom but had food, shelter and protection from invaders in the manor, which is a large house within a landed estate.