Which of the following correctly describes the events that led to the fall of the roman empire?

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To many historians the fall of the Roman Empire has always been viewed as the end of the ancient world and the onset of the Middle Ages, often improperly called the Dark Ages, despite Petrarch’s assertion. Since much of the west had already fallen by the middle of the fifth century, when a writer speaks of the fall of the empire, he or she generally refers to the fall of the city of Rome. Although historians generally agree on the year of the fall, 476 CE, they often disagree on its causes. English historian Edward Gibbon, who wrote in the late 18th century CE, points to the rise of Christianity and its effect on the Roman psyche while others believe the decline and fall was due, in part, to the influx of 'barbarians' from the north and west.

Whatever the cause, whether it was religion, external attack, or the internal decay of the city itself, the debate continues to the present day; however, one significant point must be established before a discussion of the roots of the fall can continue: the decline and fall was only in the west. The eastern half - that which would eventually be called the Byzantine Empire - would continue for several centuries, and, in many ways, it retained a unique Roman identity.