Final answer:
Fungi and bacteria (Option d) are responsible for the production of various foods through fermentation, such as cheese, wine, beer, bread, and yogurt. They also function as decomposers in the environment and have been used to produce antibiotics.
Step-by-step explanation:
The microbacterial activity responsible for the production of various foods is mainly due to the organisms: D) fungi and bacteria. Foods such as cheese, wine, beer and bread, and yogurt are produced through the fermentation processes carried out by these microbes. While fungi do contribute to the production of foods like bread and cheese, bacteria are particularly renowned for their role in the fermentation of dairy products to produce yogurt.
Furthermore, it's important to note that prokaryotic cells are distinct to bacteria and archaea, which are different from eukaryotic microbes such as fungi, protozoa, and algae. Bacteria and fungi also play a key role in the environment as decomposers, breaking down dead organic matter and releasing nutrients back into the ecosystem. Additionally, fungi have been utilized to produce antibiotics like penicillin.