Correct answer is (c) Super-class
Best explanation: Super-class is a taxonomic category that is just above the class and below sub-phylum. Animal kingdom is divided into 10 phyla and one among them is Chordates. Chordates are further classified into two sub-phylum, namely, protochordates and vertebrata. Vertebrata are further classified into super classes, namely, agnatha and gnathostomata.