Fish and other aquatic life depend on oxygen gas dissolved in the water. Which event is most likely to harm aquatic life by reducing the oxygen concentration of the water?

Eutrophication, often caused by nutrient runoff from agricultural fields or wastewater, is a key event that can harm aquatic life by reducing oxygen concentration in water. This process leads to excessive growth of algae, which, when they decompose, consume significant amounts of dissolved oxygen, creating "dead zones" where aquatic life cannot survive. Additionally, factors like pollution and increased water temperatures can exacerbate this issue, further diminishing oxygen availability for fish and other aquatic organisms.