One major change that occurred after the Fall of Rome was...

The phrase "the Fall of Rome" suggests that some cataclysmic event ended the Roman Empire, which stretched from the British Isles to Egypt and Iraq. But in the end, there was no straining at the gates, no barbarian horde that dispatched the Roman Empire in one fell swoop.

Instead, the Roman Empire fell slowly as a result of challenges from within and without, changing over the course of hundreds of years until its form was unrecognizable. Because of the long process, different historians have placed an end date at many different points on a continuum. Perhaps the Fall of Rome is best understood as a compilation of various maladies that altered a large swath of human habitation over many hundreds of years.

Explanation:

option d is correct. corroborated sources of historical evidence   is necessary to validate a claim about an event in history.

historians tend to use written sources, but audio and visual materials as well as artifacts are important objects that supply information to modern historians.

historical sources are usually divided into two categories: primary and secondary sources. depending on the historian's intent, some sources shift their designation. determining what type of sources toimplement, and the level of credibility and reliability of those sources, is a significant step in critical thinking for the historian.

explanation:

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