A writer should provide sources for reviews in order to

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present information as objectively and accurately as possible
show the writer has an informed viewpoint
show the writer is unbiased
all of the above are reasons why a writer should provide sources for reviews

The correct answer is: all of the above are reasons why a writer should provide sources for reviews. By providing sources for their reviews, a writer can ensure that the information presented is objective, accurate, and informed, and can also demonstrate their unbiased viewpoint. This helps to build credibility and trust with readers.