Why did the number of strikes greatly increase in the years immediately following world war i? the ku klux klan engaged in criminal activity against workers. activism was the social norm in the years after the war. strikes would no longer interfere with the war effort. employers hired many socialists and communists.

c

explanation:

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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: