Sea Otters Have Been Used as an Example of the "Keystone

Sea otters have been used as an example of the "Keystone Species" concept.This means that sea otters

A) provide the carnivorous component of the food chain in which they live.
B) promote the edge effect in the kelp forests off the northern coastline of California.
C) exert a particular strong influence on the structure and functioning of an ecosystem.
D) offer an opportunity for scientists to study the long-term effects as the sea otter populations are harvesteD.
E) interactions with the kelp forests and the sea urchins have not really had any consequences that need to be currently studied.