What the Indian Ocean trade an important trade route ?

The Indian Ocean trade routes is connected Southeast Asia, India, Arabia, and East Africa, the camels domestication had helped bring coastal trade goods such as silk, porcelain, spices, incense, and ivory to inland empires, as well

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are their options?

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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.

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