The correct response is: Secondary and tertiary consumers have to consume a lot more food to support themselves, so there are fewer of them.
In an energy pyramid, energy decreases as you move up the levels because energy is lost at each trophic level, primarily through metabolic processes and heat. Consequently, there is less biomass available to support higher trophic levels (secondary and tertiary consumers), resulting in fewer individuals compared to primary producers and primary consumers at the base of the pyramid.