Do not allow customers to refill dirty plates because that can lead to which type of contamination? a. Biological d. Ecological b. Physical c. Chemical

The correct answer is a. Biological.Refilling dirty plates can lead to biological contamination. Biological contamination occurs when harmful bacteria or other microorganisms grow on food or surfaces. Dirty plates can harbor these microorganisms, which can then be transferred to the food being prepared, leading to potential foodborne illnesses.