The correct response is clothing.
Clothing is a private good because it is both rivalrous and excludable; one person's consumption of clothing prevents another from consuming the same item, and access to clothing can be restricted (i.e., you can keep others from using your clothing).
In contrast, a clean environment and national defense are examples of public goods, and education can vary but is often considered a mixed good, depending on how it's provided (public vs. private education).
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