For this chain-of-thought reasoning and answer, what was the question?
Biomass is the total mass of organisms at a trophic level. An organism is a living thing. Biomass is the total mass of living things at a trophic level.
 A: (E)
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Q: Biomass is the total mass of what at a trophic level?
Options:
- (A) Plants growth
- (B) peachleaf willow
- (C) Conifers
- (D) animals
- (E) living things
- (F) Most plants
- (G) all matter
- (H) insects
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