Select the option which shows the correct combination of a phylum and its characteristic feature.

• A

  Platyhelminthes-An excretory tube removes body wastes from the body cavity through the excretory pore.

• B

  Aschelminthes-Specialised cells called flame cells help in osmo-regulation and excretion

• C

  Annelida-The body is covered by chitinous exoskeleton

• D

  Ctenophora-The body bears eight external rows of ciliated comb plates, which help in locomotion