What is an explanation of why producers are always found at the lowest trophic level?
a.producers are larger than consumers.
b.consumers are eaten by a variety of producers.
c.producers convert light energy into chemical energy.
d.producers are found in fewer numbers than consumers.

I believe the answer is: C.Producers convert light energy into chemical energy

As organisms move up higher on the trophic level, they would become much more dependant toward consuming other organism to obtain their energy.
Producers who placed the lowest on the trophic level could produce energy without consuming other organism due to photosynthetic ability.

not sure- but i guess?