Why Are Keystone Predators Like Lions and Eagle So Rare

Multiple Choice

Why are keystone predators like lions and eagle so rare in a community?

A) Because only a small amount of the energy is passed from one trophic level to the next
B) Because they do not breed as fast as other animals
C) Because of predation by higher predators
D) Because it is difficult for them to learn how to capture prey
E) Because their job is to keep the population size of other animals in check