Why does reducing oil pollution in the oceans require an international effort?

A.Humans do not have the resources to stop ocean pollution.
B.Natural occurrences cause far more ocean pollution than human activities.
C.Half of Earth’s oceans are not owned by any particular country.
D.Cleaning oil pollution requires approval from the United Nations.

The answer is C. Half of Earth's oceans are not owned by any particular country, which means that reducing oil pollution in those areas can only be achieved through international cooperation and agreements between multiple countries. Additionally, oil pollution can easily spread across borders and affect multiple countries, making it necessary for a coordinated international effort to effectively address the problem.