Which earth worm species is most efficient for Vermiculture?

Answer: Option A

Eisenia Fetida is the earthworm species that is most efficient for vermiculture. The common names of this earthworm are manure worm, red worm, wiggler worm, etc. red wigglers are reddish brown, have small rings around their body and have a yellowish tail.
It is used for vermicomposting of both domestic and industrial waste. Vermicomposting septic systems have been used for decades and allow for decentralized on-site processing of black water using Eisenia fetida.