For earthworms,identify the $(i)$ Class,$(ii)$ Genus,$(iii)$ Order,and $(iv)$ Family.

• A
  $(i)$ Polychaeta,$(ii)$ Pheretima,$(iii)$ Orthoptera,$(iv)$ Megascolecidae
• B
  $(i)$ Oligochaeta,$(ii)$ Pheretima,$(iii)$ Opisthopora,$(iv)$ Megascolecidae
• C
  $(i)$ Oligochaeta,$(ii)$ Periplaneta,$(iii)$ Opisthopora,$(iv)$ Blattidae
• D
  $(i)$ Oligochaeta,$(ii)$ Pheretima,$(iii)$ Orthoptera,$(iv)$ Megascolecidae