From sparrow to grass energy transfer most likely occurs between organisms in the food web. Thus the correct option is B.
In food webs and food chains, there are different trophic levels, this includes producers such as plants, primary consumers such as herbivores, tertiary consumers such as carnivores, among others.
These levels are closely related in terms of energy as most organisms obtain energy by consuming others at a lower trophic level. For example, herbivores such as rabbits obtain energy by consuming plants (producers).
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