During El Niño Events, Primary Production by Phytoplankton Increases Sharply

During El Niño events, primary production by phytoplankton increases sharply in the Great Salt Lake of Utah. This is because

A) water temperatures increase.
B) nutrient concentrations are increased as lake volume shrinks.
C) decreasing salinity allows invasion of predators that control brine shrimp populations.
D) decreasing salinity allows invasion of more phytoplankton species.
E) decreasing dissolved oxygen increases the efficiency of photosynthesis.