Final answer:
Milk is an example of a fermented food product due to microbial fermentation.
Step-by-step explanation:
The correct answer is D. milk. Milk is an example of a fermented food product because it undergoes microbial fermentation by bacteria to produce yogurt and cheese. Fermentation is a process where microorganisms, such as bacteria, mold, or yeast, convert sugars into alcohol, gases, and organic acids.