1. How were conditions in Europe after World War Two similar to the conditions that existed after World War One? How were the two postwar periods different?

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:

what's the passage bud?

the graph is a circle graph because it demonstrates different components of the graph in the form of a circle . pls mark brainliest!