A Major Threat to Coral Reefs Is Overgrowth of Algae

A major threat to coral reefs is overgrowth of algae that eventually smother the corals.This overgrowth results from

A) cooling of surface ocean water.
B) pollution from boat traffic.
C) overabundant nitrogen in runoff from fertilized crops.
D) hurricane damage that creates habitat for algae.
E) oil spills that nourish algae.