What sequence describes eutrophication in coastal waters and its consequences?

• A. Algal blooms from nutrient runoff followed by decomposition reduces dissolved oxygen, causing hypoxic conditions and biodiversity loss.
• B. Increased dissolved oxygen due to photosynthesis.
• C. Nutrient depletion leads to clearer water and more primary production.
• D. Physical mixing alone drives oxygen fluctuations without algal blooms.

Answer: (A)