Why was archduke franz ferdinand of austria-hungary a key player in world war 1

Archduke Franz Ferdinand of Austria-Hungary was a key player in World War I because it started as a result of his assassination.

Explanation:

Franz Ferdinand was archduke of Austria, imperial prince of Austria, royal prince of Hungary and Bohemia and, from 1896 until his death, the heir to the Austro-Hungarian throne. His murder in Sarajevo on June 28, 1914, precipitated the declaration of war of Austria against Serbia that unleashed the First World War.

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:

pinterest: xxxsociety (if anyone sees this follow me on there xd)