Answer:
The correct answer will be option-C
Step-by-step explanation:
Termites are the insects which feed on the wood. Termites are unable to digest the food material that is cellulose on their own which is mediated by the single-celled organism called Trichonympha.
Trichonympha is the protozoans which live inside the guts of these termites s endosymbionts as these protozoans help digest the cellulose by producing cellulases and in return favored by the termites receiving the shelter and the food.
Thus, Option-C is the correct answer.