Which example describes a primary source? A. A biography of Charlemagne written by his friend and attendant
Einhard in the early 9th century
B. A movie about the lives of Charlemagne and his friend and
attendant Einhard
C. A painting of Charlemagne made by a Renaissance artist in the
15th century
D. An article discussing the political actions of Charlemagne written
by an American professor

A.

Explanation:

because his friend who wrote the bio was an eyewitness to his friends life so and a primary source is someone who was there when something happened or someone who has first hand knowledge/experience about something, which, in this case, is Charlemagne's friend.

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:

a woodchuck would chuck 12.5 wood : 3