What is an explanation of why producers are always found at the lowest trophic level?

This answer is probably late, but the answer that you put is right :) ( C.)

Explanation:

The reason why producers are always found at the lowest trophic level is because there is no need for them to consume other organisms (or living things) to be able to get their energy.

In other words, they do not need to consume living things to produce energy. They make their own food.

Hope this helps! :)

the generally accepted parts of modern cell theory include: all known living things are made up of one or more cells. all living cells arise from pre-existing cells by division. the cell is the fundamental unit of structure and function in all living organisms.