Final answer:
Bacon is not made by fermentation; yogurt, cheese, and bread are products of fermentation processes involving the conversion of sugars into lactic acid, alcohol, gases, or organic acids by bacteria, mold, or yeast.
Step-by-step explanation:
The food that is NOT made by fermentation is d) Bacon. Fermentation is a type of respiration that doesn't use oxygen, and it involves the use of bacteria, mold, or yeast to convert sugars into alcohol, gases, or organic acids. Foods like yogurt, cheese, and bread are well-known products of fermentation processes. Yogurt, for instance, is made from milk fermented with bacteria that turn milk sugars into lactic acid, which causes proteins in the milk to form into a solid mass. Likewise, cheese is produced through the action of bacteria on milk sugars, converting them into lactic acid, which results in the milk curdling.