Refer to the Figure

Refer to the figure. In the top-down situation shown, what is the relationship between top carnivores (secondary consumers) and the abundance or biomass of primary producers in a food web?

A) There is no relationship; secondary consumers affect only primary consumers.
B) Secondary consumers cause an increase in primary producers.
C) Secondary consumers cause a decrease in primary producers.
D) Primary producers cause an increase in secondary consumers.
E) Primary producers cause a decrease in secondary consumers.