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A foodborne illness outbreak is defined by two or more unrelated individuals experiencing similar symptoms after consuming the same contaminated food. This definition is significant because it indicates a common source of infection, which can help public health officials identify and address the cause of the illness. By establishing that the illnesses are related through a shared food source, it becomes possible to implement measures to prevent further cases, conduct investigations, and inform the public.

While a single individual showing symptoms after eating contaminated food can indicate a food safety issue, it does not constitute an outbreak due to the absence of multiple cases to confirm a broader problem. Complaints about food quality do not necessarily indicate an outbreak, as they can stem from issues unrelated to foodborne illness. Lastly, a single case of severe food poisoning, even if caused by contaminated food, fails to meet the criteria for an outbreak without additional cases linked to the same food source. Thus, option B accurately captures the definition of a foodborne illness outbreak.