In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?

• A
  $Pila \implies (i)$ Body unsegmented, $(ii)$ Mouth with radula, Phylum: Mollusca
• B
  $Asterias \implies (i)$ Spiny skinned, $(ii)$ Water vascular system, Phylum: Echinodermata
• C
  $Sycon \implies (i)$ Pore bearing, $(ii)$ Canal system, Phylum: Porifera
• D
  $Periplaneta \implies (i)$ Jointed appendages, $(ii)$ Chitinous exoskeleton, Phylum: Arthropoda