The most accurate evaluation among the provided responses regarding the impact of feudalism after the fall of Western Rome is:
Feudalism was an effective protective measure against Germanic tribes.
Feudalism arose in part as a response to the inability of centralized Roman authority to protect its citizens from invasions and raids, particularly from various Germanic tribes. It established a system of local control where lords provided protection in exchange for service and loyalty from vassals. The other statements do not accurately reflect the historical context or developments related to feudalism.