Living Diatoms Contain Brownish Plastids

Multiple Choice

Living diatoms contain brownish plastids. If global climate change continues to warm surface waters of Earth's oceans, which of the following is the most likely effect on the animals that build coral reefs?

A) The coral animals, which capture planktonic organisms, may be outcompeted by the diatoms.
B) The coral animals' endosymbiotic dinoflagellates may get "shaded out" by the diatoms.
C) The coral animals may die from overeating the plentiful diatoms with their cases of silica.
D) The diatoms' photosynthetic output may over-oxygenate the water.