What is the term for any change in the normal condition of food that makes it unfit for consumption?

The correct answer is food spoilage.

Explanation:

Food spoilage takes place when the items of food are kept for a longer duration and are not stored adequately, thus, they get spoiled or contaminated, and such items of food are not good for health. Once the food gets spoiled, it cannot be consumed and has to be discarded. Spoilage refers to a procedure in which the items of food get damaged to a point in which it is not palatable to humans.  

There are various elements that can result in food spoilage like yeast, bacteria, moisture, mold, chemical reaction, light, and temperature. The signs of food getting spoiled comprise an appearance, which is distinct from the fresh food as a change in texture, a change in color, and an unpleasant taste or odor.  

depends where it is? i got mine on my arm and from 1-10 it was a 3 different spots react differently

c. will be your answer sorry if im wrong tho