What Accounts for the Pyramid Shape of the Diagram That

What accounts for the pyramid shape of the diagram that represents energy in trophic groups in an ecosystem?

A) Energy produced by consumers is greater than energy stored by producers.
B) Energy stored by consumers is greater than energy stored by producers.
C) Energy is gained as it moves from one trophic level to the next.
D) Energy is lost as it moves from one trophic level to the next.