Final answer:
Cooking different types of food in the same fryer oil does not help prevent allergic reactions and can cause cross-contact of allergens, posing a risk to customers with food allergies.
Step-by-step explanation:
The option that does not help prevent allergic reactions when serving food to customers with food allergies is A. Cooking different types of food in the same fryer oil. This is because cooking multiple food types in the same oil can cause cross-contact of allergens, where traces of allergenic substances can transfer to different foods, leading to unintentional exposure for allergic individuals. To prevent foodborne illness and allergic reactions, it's crucial to maintain strict cross-contamination prevention measures.
On the other hand, options B. Washing, rinsing, and sanitizing cookware, equipment, and utensils before preparing food, C. Identifying ingredients to the public, including any "secret" ingredients, and D. Assigning specific equipment for preparing food for customers with food allergies all contribute to reducing the risks of allergen exposure and are recommended practices in food safety.