Which of the following statements is incorrect about the class-Hydrozoa of phylum-Cnidaria? (A) ...

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Which of the following statements is incorrect about the class-Hydrozoa of phylum-Cnidaria?
(A) They lack a stomodaeum and the gastrovascular cavity is without partitions and nematocysts
(B) The mesoglea is cellular and seen as a thick transient layer
(C) The highest degree of polymorphism in phylum-Cnidaria is shown by the organisms of this class
(D) Gametes in the organisms of this class are epidermal in origin
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