Which of the following is a sign of food spoilage?

An unusual odor is a significant indicator of food spoilage. When food starts to spoil, it often undergoes chemical changes, which can result in the production of gases or other compounds that emit unpleasant smells. This change in odor can signal that the food is no longer safe to consume and may be harboring harmful bacteria or toxins.

Bright color, normal texture, and consistent temperature are generally signs of fresh, safe food. Bright colors can be typical for fresh fruits and vegetables, while normal texture indicates that the food has not yet deteriorated. A consistent temperature is crucial for food safety but does not directly indicate spoilage; rather, improper temperature control can lead to spoilage over time.