Correct answer is (a) Perionyx
To elaborate: Perionyx excavates, species is most stable in Indian conditions for temperate climatic conditions, whereas, Epifilis, Endogens, Aneciques are the most common species of earthworms used as Vermicomposting earthworms, some with dark pigments and some with uniform coloration having high growth rate, the digestion rate and absorption rate of the consumed food by earthworms is high and they can very well adapt to the changing environmental conditions.