In aquatic ecosystem, phytoplankton and other photosynthetic organisms appear in the upper layer of the water, but not deeper layers. Which statement explains this distribution? A.) The deeper layers are too dark for photosynthesis to occur

B.) The deeper layers are too cold for photosynthesis to occur

C.) The deeper layers have too little oxygen for photosynthetic organisms to survive

D.) The deeper layers have too much carbon dioxide for photosynthetic organisms to survive