Study the following statements.
a.    The body is dorsoventrally flattened.
b.    Hooks and suckers are present in parasitic forms.
c.    Flame cells help in excretion and osmoregulation.
d.    Fertilisation is internal.
The above are the general characters of the phylum

 

• A

  Platyhelminthes

• B

  Aschelminthes

• C

  Annelida

• D

  Ctenophora