In a food chain, which trophic level contains the greatest amount of energy?
a.
herbivores
b.
carnivores
c.
producers
d.
decomposers

producers because they need photosythesis to make energy to grow there own food

It is the producers. In order for the ecosystem to sustain itself, there must be more energy at lower trophic levels than there is at higher trophic levels. This allows organisms on the lower levels to not only to maintain a stable population, but also to transfer energy up the pyramid.
For more help onecological pyramids, go to https://en.wikipedia.org/wiki/Ecological_pyramid
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