Which of the following battles is often considered as marking the beginning of the fall of the Western Roman Empire?

The Battle of Adrianople is often considered as marking the beginning of the fall of the Western Roman Empire due to its significant impact on the empire's military and political standing. Taking place in 378 AD, the battle saw the Roman forces led by Emperor Valens suffering a disastrous defeat at the hands of the Visigoths, a Germanic tribe. This defeat resulted in the death of Emperor Valens and a considerable loss of men and resources for the Roman Empire. It marked a turning point where the Roman military power was weakened, and it allowed for subsequent barbarian invasions and internal conflicts that contributed to the eventual collapse of the Western Roman Empire.