Which of the following best explains why marine debris is not caused solely by countries bordering the ocean? a. marine debris mostly originates from oceangoing ships. b. debris is carried to the ocean by winds, rivers, and storms. c. marine debris originates from natural sources. d. none of the above

The option that best explains why marine debris is not caused solely by countries bordering the ocean is B. debris is carried to the ocean by winds, rivers, and storms. So not only those countries that are located by the ocean are responsible for such a thing - winds and storms, as well as rivers and other waters can bring various kinds of debris into the ocean from distant countries, not only the ones directly bordering it.