Answer: A. Fewer geographic barriers protected Northern Europeans from invasion by enemies.
Explanation: Feudalism took hold more strongly in Northern Europe than in Southern Europe due to the presence of fewer geographic barriers that protected Northern Europeans from invasion by enemies. In Northern Europe, the low-lying land made it easier for invaders to penetrate and conquer the territory, which led to the development of a decentralized system of government known as feudalism. Under feudalism, local lords were granted land and political power in exchange for their military support and loyalty. This system provided greater security for the people and helped to protect against invasions. In contrast, Southern Europe had more mountainous terrain and rugged coastline, which made it more difficult for invaders to penetrate and conquer the territory. This physical protection may have contributed to a more centralized system of government in Southern Europe, which reduced the need for a feudal system.