Givenbelow is the representation of the extent of global diversity of invertebrates. What groups the four portions (A-D) represent respectively ? 

        A                            B                             C                               D

(a) insects               Crustaceans               Other animal                 Molluscs

(b) Insects           Other animal groups       Crustaceans                  Molluscs                

(c) Molluscs         Other animal groups       Crustaceans                    Insects

(d) Insects                 Molluscs                  Crustaceans              Other animal groups

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