Usually, when a brochure is vague, its give an impression that the writer lacks credibility.
What is a brochure?
A brochure is an educative tool used to circulate important information about the product or service.
A brochure is vague when its content is uncertain, indefinite, unclear etc
Hence, when a brochure is vague, its give an impression that the writer lacks credibility.
Therefore, the Option C is correct.
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