(B) The class $Oligochaeta$ belongs to the phylum $Annelida$. The most common example of an organism belonging to the class $Oligochaeta$ is the earth

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(B) The class $Oligochaeta$ belongs to the phylum $Annelida$. The most common example of an organism belonging to the class $Oligochaeta$ is the earthworm ($Pheretima$ $posthuma$). Cockroaches belong to the class $Insecta$,frogs belong to the class $Amphibia$,and pigeons belong to the class $Aves$.