Final answer:
A food handler may only wear a plain band, like a wedding ring, while prepping food to minimize the risk of contamination and physical hazards.
Step-by-step explanation:
The only jewelry a food handler may wear while prepping food is a plain band such as a wedding ring. According to food safety regulations, most jewelry, including bracelets, watches, and necklaces, can harbor bacteria and potentially contaminate the food. Jewelry pieces can also be a physical hazard if they fall into the food being prepared. A plain wedding ring is usually allowed because it is less likely to trap harmful pathogens and is considered a simple band without stones or intricate designs that could harbor bacteria.