Answer:
The correct answer is option - c. protozoa.
Explanation:
Amoeba and other protozoans are located at the third trophic level of the soil food chain. Nematodes are generally present in the second trophic level but sometimes in the third trophic level also.
Bacteria and fungi have a place in the second trophic level in the soil food chain. Amoeba engulfs bacteria for nutrition.
Thus, the correct answer is option- c. protozoa.
