Fishermen Living Along the North Pacific Rim Felt Threatened by Increased

Fishermen living along the North Pacific Rim felt threatened by increased populations of sea otters because sea otters consume commercially valuable abalone, sea urchins, and spiny lobster. What beneficial aspect of sea otter ecology did these fishermen ignore?

A) Sea otters are consumed by killer whales, which would otherwise eat commercially valuable fish.
B) Sea otters catch and eat trash fish, allowing stocks of commercially valuable fish to increase.
C) Sea otters catch and eat sea urchins, thereby protecting kelps, which in turn shelter populations of larval fish.
D) Sea otters have been used in medical research to develop vaccines that protect domestic cats from a variety of diseases.