Which of the following best illustrates a public good?

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Grilled sausages at a community gatheringMarine mammals swimming freely in the seaProtection provided by the country's militaryFruit growing on a tree located in a city park

Explanation

A public good is one that is non-excludable and non-rivalrous. Among the options, national defense fits this definition because it benefits all citizens without excluding anyone or reducing availability. In contrast, hot dogs, whales, and apples are either rivalrous or excludable.