Explain What development in Europe that led to the creation of new states in the period 1914-1939

The dissolution of the German, Russian, Austro-Hungarian, and Ottoman empires created a number of new countries in eastern Europe and the Middle East, often with large ethnic minorities. This caused numerous conflicts and hostilities.

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i believe 5 is correct answer

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.

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