Final answer:
A food handler should sanitize their hands as the final step before preparing ready-to-eat foods to prevent the spread of foodborne diseases. Proper handwashing with soap and warm water, or using hand sanitizer when necessary, is essential.
Step-by-step explanation:
The final step a food handler should follow before preparing ready-to-eat foods is B. Sanitize their hands. Proper handwashing is essential and is one of the most effective ways to prevent the spread of foodborne diseases. Before preparing or eating food, handling raw meats, or after using the bathroom, it is critical to wash hands thoroughly. Using soap and warm water is the most effective method for washing hands. When soap and water aren't available, hand sanitizer may be used as an alternative. Wearing single-use gloves can provide an additional layer of protection, especially when handling ready-to-eat foods to prevent any direct contact with hands.