Which statement accurately describes events in the soviet union in world war ii?
a. stalin violated the friendship pact he had signed with hitler and invaded germany in 1941.
b. the russian people were so opposed to stalin that they refused to fight against the nazis.
c. the soviet union became an ally of the united states and great britain during world war ii.
d. hitler admired the russian people and considered them to be part of his so-called "master race."

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: