Read the following statements and answer the question.
(i) They are exclusively marine, radially symmetrical, diploblastic organisms with tissue level of organisation.
(ii) Body bears eight external rows of ciliated comb plates, which help in locomotion.
(iii) Digestion is both extracellular and intracellular.
(iv) Reproduction takes place only by sexual means.
Which of the following phylum is being described by above statements?

A. Platyhelminthes

B. Arthropoda

C. Mollusca

D. Ctenophora

Please do not use chat terms. Example: avoid using "grt" instead of "great".