The prodution process is never complete unti it reaches the final consumer​

One thing is to produce goods and quite another to make the goods available to the ultimate consumers. It is known that production is not yet complete until the goods produced reaches the final consumers for production to get to the ultimate buyers the firm or producers engages the services of the middlemen.

Explanation:

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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