The answer would be Pollution. Pollution is an example of a negative externality, which refer to various factors that resulted from company's productivity. One of the common example of this is the air pollution , which will bring harm to the environment
When one closes off an area to stop people or goods from entering or leaving a place this means that an embargo on goods is present. This is usually done when one doesn't want a nation to continue its economic relationship with other nations. When people are stopped from entering or leaving a place, this would mean that they are put under quarantine.
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Answer:
Last option
Explanation:
Athens used the shared navy for their own benefits