Which of the following scenarios exemplifies both non-rivalry and a potential tragedy of the commons in the context of public goods?

A good example of a public good that shows both non-rivalry and potential tragedy of the commons is a clean beach. Non-rivalry means that one person enjoying the beach does not stop others from enjoying it too; everyone can use it at the same time without taking away from each other's experience. However, if too many people visit the beach and leave litter or damage the natural environment, it can lead to a tragedy of the commons, where the beach becomes less enjoyable for everyone. For instance, if everyone thinks, "I can leave my trash because others will clean it up," the beach can become polluted, making it less appealing for all visitors. This situation shows how public goods can be enjoyed by many, but if not cared for properly, they can be harmed by the very people using them.