The correct option is B Pisces
Fishes belong to the phylum Chordata as they have a notochord during embryonic stages. They belong to subphylum Vertebrata as they have a vertebral column and to division Gnathostomata as they have mouth bound by jaws. They also belong to superclass Pisces as they have fins for locomotion and gills for respiration.
Superclass Pisces includes two classes, Chondrichthyes and Osteichthyes.