The correct option is B Nereis
A pseudocoelom is a fluid filled body cavity which surrounds the gut. It is lined on one side only by mesoderm. All animals of phylum Aschelminthes have pseudocoeloms. Filaria worm whose scientific name is Wuchereria, roundworm and hook worm are all examples of this phylum.
Nereis is a part of annelida and they are coelomates.