In most food webs there are many producers, fewer herbivores, and even fewer carnivores. Which statement best explains why there are always fewer carnivores than producers in a food web?

A. There is not enough space to illustrate them.
B. Each successive trophic level has less available energy for the organisms at that level.
C. An energy pyramid indicates how efficiently carnivores use energy obtained from producers.
D. Food webs do not show the energy that carnivores obtain elsewhere in the environment.