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All living organisms in any given ecosystem are linked in a systematic chain with respect to their mode of production of food or feeding habits. This sequential interlinking of organisms involving transfer of food energy from producers through a series of organisms with repeated eating and being eaten is called the food chain. A food chain may have 3-4 trophic levels. Each step or level of the food chain forms a trophic level. The autotrophs or the producers are at the first trophic level. They fix up the solar energy and make it available for heterotrophs or the consumers. The herbivores or the primary consumers come at the second, small carnivores or the secondary consumers at the third and larger carnivores or the tertiary consumers form the fourth trophic level.

Consider the following food chain. Identify which of the following can be placed at \( X \).
Grass \( \rightarrow \mathrm{X} \rightarrow \) Frog \( \rightarrow \) Snake \( \rightarrow \) Eagle
a. Grasshopper
b. Rabbit
c. Phytoplankton
d. Rat
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