The Presence of What Features(s)would Exclude the Cnidarians and Ctenophores

The presence of what features(s) would exclude the cnidarians and ctenophores as possibilities for the identity of a newly discovered animal?

A) Nervous tissue-it is absent in cnidarians and ctenophores.
B) A mouth that develops from the blastopore-in cnidarians and ctenophore the blastopore becomes the anus.
C) A body constructed from three tissue layers-in cnidarians and ctenophores the body wall is constructed from two tissue layers.
D) All of the above are characteristics that are absent in cnidarians and ctenophores.