In Tidal Pools,the Food Pyramid Is "Inverted

In tidal pools,the food pyramid is "inverted." There is a small base of phytoplankton and a larger top of zooplankton.

A) This proves that sometimes it is possible for a small amount of plant tissue to produce a large amount of herbivores.
B) This is based on numbers,and there are a few large algae plants feeding many very small animals.
C) These plants are actually deriving their food from dying animals,thus the pyramid is inverted.
D) The pyramid appears inverted because it is based on a very short time sample,over a year the algae production would likely be ten times the zooplankton in biomass or energy.