Which of the following can be natural sources of water pollution? a. volcanic activity b. earthquakes c. algae blooms d. all of the above

Algal blooms can be source of water pollution because of the eutrophication process due to the overpopulation of algae in the body of water. Volcanic activity does not reach water as well as earthquakes in which only the biggest impact is through tsunami which is rare enough to be neglible.

C is the correct answer.
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The correct answer should be brand c.