Answer:
A. fifth
Explanation:
The fall of the Roman Empire of the West was the period of decline of the Roman Empire of the West in which it lost the authority to exercise its dominion and its vast territory was divided into numerous successor political entities.
Relevant dates include the year 117, when the Empire reached its greatest territorial extension, and the rise of Diocletian in 284. The irreversible territorial losses, however, began in 386 with a large-scale invasion of Goths and other peoples. In 395, after imposing itself on two destructive civil wars, Theodosius I died, leaving a collapsed army and the empire, still plagued by Goths, divided between their two incapable children. By 476, when Odoacro deposed Emperor Romulus, the Roman emperor of the West exercised an insignificant military, political and financial power, and lacked effective control over the dispersed territories in the West that could still be described as "Romans." The "barbarian" invaders established their own authority in most of the area of the Western Empire. Although its legitimacy survived for several more centuries, and its cultural influence persists to this day, the Western Empire never had the strength to rise again.