The WPA also improved and built new inter-city roads and paved countless city streets and sidewalks. These not only helped farmers but eased travel generally, benefiting sales and delivery people, truckers and commuters — indeed, everyone whose job depended on getting from one place to another safely, quickly and efficiently. Which of the following conclusions can be drawn from this selection?

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:

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