Which invertebrate phylum is characterized by the ability of regeneration?

The given figure shows four animals $A, B, C$ and $D$. Select the correct option regarding the common features shared by any two of them.

Find out the incorrect match in the following options.

Given below are two statements:
Statement $I$: When any plane passing through the central axis of the body divides the organism into two identical halves, it is called radial symmetry.
Statement $II$: In phylum Echinodermata, both adults and larvae are radially symmetrical.
In the light of the above statements, choose the most appropriate answer from the options given below:

In which of the following do the organisms of the Kingdom Animalia show great diversity?

Which of the following is observed in the adult stage of $Cnidaria$ and $Echinodermata$?