What challenges did Catherine the Great face during her rule?

Explanation:

Catherine faced down more than a dozen uprisings during her reign. Of the various uprisings that threatened Catherine's rule, the most dangerous came in 1773, when a group of armed Cossacks and peasants led by Emelyan Pugachev rebelled against the harsh socioeconomic conditions of Russia's lowest class, the serfs.

i told you before its c

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: