Which of the following is an example of a proof provider in an anecdotal form?

The correct answer, case histories, is an example of a proof provider in anecdotal form because they present real-life examples that illustrate how a product or service has successfully solved specific problems or met the needs of customers. These narratives often include details about the challenges faced by a customer, the solution provided by the company, and the positive outcomes achieved. This storytelling approach helps potential customers relate to the experiences of others and can build trust and credibility.

In contrast, testimonials generally offer brief endorsements from satisfied customers without delving into the specific context or background of the situation. Data sheets and graphs or charts present quantitative information and analytics, which support claims with facts but do not provide the personal insights or narrative context that case histories do. Thus, case histories stand out as a more compelling anecdotal form of proof due to their detailed storytelling approach.