Which one of the following animals belongs to the phylum Cnidaria?

Study the following statements
A) Corallium rubrum is the precious red stone coral that belongs to Scyphozoa
B) Renette gland is an excretory gland found in round worms
C) Tubifex is an aquatic annelid
D) In chilopods, maxillae are modified into gnathochilarium

Among the above, the incorrect statements are

The characterstic by which Annelida advanced over Nematoda is/are

Metamerism is characteristic of

Heteronomous segmentation, i.e., the division of labour resulting in dissimilarity of the metameres of the different regions of the body, is found in the phyla