Which of the following is considered a common physical hazard?

The correct selection highlights glass as a common physical hazard in the context of food safety. Physical hazards are any extraneous materials that can contaminate food products and pose a risk to consumer health. Glass can originate from broken containers, such as bottles or jars, and even from equipment used in food processing. When present in food, glass poses a serious risk of cuts or injuries to consumers, making it a significant concern during hazard analysis.

Nails, while also a potential physical hazard, are less commonly discussed in the context of food but can certainly cause injuries. Mold, on the other hand, is a biological hazard associated with spoilage and health concerns rather than a physical one, since it involves microorganisms. Construction debris may pose risks during the construction or renovation of a food facility but isn't typically classified under common physical hazards affecting food itself. In this context, glass clearly emerges as a more prevalent example of a physical hazard that can directly affect food safety.