Final answer:
All the listed vegetables, including Bell peppers, Zucchini, and Eggplant, should be washed before cooking to remove microbes and prevent foodborne diseases.
Step-by-step explanation:
The question asks which of the following requires washing before cooking: 1) Bell peppers 2) Zucchini 3) Eggplant 4) All of the above. The correct answer is 4) All of the above. Regular handwashing is crucial for preventing foodborne diseases, and washing vegetables before consumption is an essential practice. Vegetables like bell peppers, zucchini, and eggplant should be rinsed before eating to remove any potential microbes or toxins on the surface, regardless if you're planning to consume the skin or not. This step is even more important if the vegetables are to be eaten raw, but it is a good safety practice for cooking as well.