Final answer:
Mold is the physical hazard among the given options as it can cause allergic reactions, respiratory problems, and can produce toxins.
Step-by-step explanation:
The physical hazard among the given options is Mold. Mold can release spores that can cause allergic reactions and respiratory problems in humans. It can also produce toxins that can be harmful if ingested or inhaled. Mold can grow on various surfaces in homes, especially in moist and humid environments, making it important to address any mold issues promptly.