The correct option is B Snake
Organic remains (dead plant parts, animal remains, and excretions) are also called detritus. A food chain, which begins which begins with detritus or dead organic matter is called detritus food chain. In the system, the energy passes into decomposers and detritivores, then to smaller carnivores, then to larger carnivores and so on. Therefore, the given food chain is the detrital food chain. Frog is eaten by a snake which completes the chain.