The delegates to the congress of vienna formed the kingdom of the netherlands by uniting the austrian netherlands and the dutch republic. they gave independence to switzerland. they also formed a german confederation by uniting 39 german states. which sentence best describes the effect of the delegates' actions on european geopolitics?

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:

i believe your answer is d)