Dissolved oxygen (DO) levels of 6 ppm were recorded in a lake the day before a sewage spill. Three days later, the DO levels in the same location were measured to be 0.5 ppm. What is the probable cause of this change in DO?
A. Decreased water temperature caused a decrease in gas solubility.
B. Decreased turbidity due to the sewage caused an increase in photosynthetic algae.
C. Decreased oxygen is available due to bacterial decomposition of organic waste.
D. Decreased carbon dioxide is produced by photosynthetic algae.
E. Decreased nitrate levels eliminated a source of dissolved oxygen.
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