How did renewed use of the Silk Road influence Italian cities? Olt weakened the middle class.
Olt strengthened the economy.
It helped to spread democracy.
It caused a decline in population.

B It strengthened the economy.

Explanation:

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B: It strengthened the economy

Explanation:

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shang dynasty

western zhou (ca. 1046-771 bce)

eastern zhou (ca. 771-256 bce)

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: