The correct option is C DFC, GFC
GFC is the gazing food chain. It begins with the producer followed by primary consumer and secondary consumer.
DFC is the detritus food chain. It begins with the decomposer.
In aquatic ecosystem, the decomposition is very less. Hence, the major conduit of energy in aquatic ecosystem is transferred through GFC. The major conduit of energy in land ecosystem is transferred through DFC than GFC.