Statement $- I :-$ All living members of class $Cyclostomata$ are ectoparasites on some fishes.
Statement $- II :-$ $Cyclostomata$ have a sucking and circular mouth without jaws.

• A
  Both statements are correct.
• B
  Both statements are incorrect.
• C
  Only statement $- I$ is correct,$II$ is incorrect.
• D
  Only statement $- II$ is correct,$I$ is incorrect.