Which is an important difference between the freedom rides and unauthorized marches? a. freedom rides were primarily carried out by northerners riding through the south, while unauthorized marches were usually carried out by southerners. b. freedom rides took place only in the deep south, while unauthorized marches were held throughout the south. c. freedom rides were testing whether an existing law would be upheld, while unauthorized marches were intentionally breaking an unjust law. d. freedom rides were intentionally provoking violence, while unauthorized marches were not attempting to provoke violence.

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:

d is the best answer for this question.

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.