It's producers because those are the one's that sell them to the consumers.
Answer 2
For #1 :The base of the pyramid is composed of species called autotrophs, the primary producers of the ecosystem. All other organisms in the ecosystem are consumers called heterotrophs, which either directly or indirectly depend on the primary producers for food energy.
For #2: Trophic level 2 Trophic level 2 includes primary consumers, organisms that eat producers.