What happened during the Dark Age of Greece?

The Greek Dark Age is the interval between the collapse of the Mycenaean civilization, around 1200 BCE, and the Greek Archaic Period, around c. 800 BCE. ... Iron-working was an innovation that seems to have been imported into Greece, not developed there, and it possibly reached Greece through Cyprus and the Near East.

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:

where are the statements?