What is the significance of this fact in the rise of the Aztec Empire in Central Mexico?

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:

6 units. ab and lo are congruent sides, and if ab= 6 units, then lo would be the same.

i think the answer is   b.