Coral Bleaching Occurs When

Coral bleaching occurs when

A) zooxanthellae undergo photosynthesis and provide waste products for the coral to grow.
B) zooxanthellae grow on coral and change their colour.
C) the symbiotic algae which cover corals and are white.
D) corals are stressed and expel their zooxanthellae leading to death by starvation.
E) coral reefs sink and are unable to photosynthesise in the deep water.