Which of the following best shows the broad scope of Thomas Edison’s work? His name was on more than 1,000 patents.
He became famous during his own lifetime.
He was a self-taught inventor.
He is still well known today.

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:

it refers to race, i am pretty sure this was a popular term in nazi germany or something.