For Most Terrestrial Ecosystems, Pyramids of Numbers, Biomass, and Energy

For most terrestrial ecosystems, pyramids of numbers, biomass, and energy are essentially the same-they have a broad base and a narrow top. The primary reason for this pattern is that

A) secondary consumers and top carnivores require less energy than producers.
B) at each step, energy is lost from the system as a result of keeping the organisms alive.
C) as matter passes through ecosystems, some of it is lost to the environment.
D) biomagnification of toxic materials limits the secondary consumers and top carnivores.
E) top carnivores and secondary consumers have a more general diet than primary producers.