Answere : The correct option is Option (a) i.e. first.
Explanation : Primary consumers eat organisms of the first trophic level.
First trophic level is represented by producers or autotrophs. It contain terrestrial green plants, cyanobacteria, and algae which capture solar energy and use photosynthesis to produce sugars.
Second trophic level is represented by organisms that consume producers. They are also known as primary consumers. Grazing animals, such as deer and grasshoppers, are primary consumers.
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