Ctenophores have similarities with members of which phylum?

Diploblastic animals belong to the phylum

Bilateral symmetry does not occur in:

The symmetry found in the phylum $Cnidaria$ is:

Coelenterates are

Which of the following statement$(s)$ is/are correct regarding phylum $Coelenterata$ (Cnidaria)?
$(A)$ They are aquatic,mostly marine,sessile or free-swimming,radially symmetrical animals.
$(B)$ They have a central gastro-vascular cavity with a single opening on hypostome.
$(C)$ Digestion is extracellular and intracellular.
$(D)$ Their members are $Sycon$,$Spongilla$ and $Euspongia$.