Final answer:
A customer getting a cut in the gum from a fish dinner is most likely due to bone contamination from small fish bones left in the meal.
Step-by-step explanation:
A customer getting a cut in the gum while eating a fish dinner in a restaurant is most likely due to c. Bone contamination. This can occur when small, brittle bones from the fish are not fully removed during preparation and end up in the dish. Choking is related to a blockage of the airway, an allergic reaction is the body's immune response to a substance, and poor cooking technique typically refers to the quality or doneness of the food, not physical hazards like bones. In this situation, a piece of fish bone may have caused the physical injury in the customer's gum.
It's important to properly clean and debone fish to prevent such injuries. Unlike food poisoning due to a preformed bacterial toxin in food, physical contamination can cause immediate physical harm, as opposed to illness that arises after consuming toxins or pathogens.