Which situation is the clearest example of cause and effect in "The City Without Us"?
O A. Some time in the next 100,000 years, glaciers will cover all of
Manhattan.
O B. If flooding were to go unchecked, steel support beams in
buildings would rust.
O C. While suspension bridges will last a few centuries, truss bridges
may last 1,000 years.
O D. Water in Manhattan's underground spaces has to be pumped out
daily.

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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:

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