Circular and sucking mouth is found in . . . . . . .

Assertion: Cyclostomates are marine but migrate for spawning to fresh water.
Reason: After spawning, within a few days they die. Their larvae after metamorphosis return to the ocean.

Match the name of the animal (Column-$I$) with one characteristic (Column-$II$), and the phylum/class (Column-$III$) to which it belongs.

Which of the following are animals belonging to the class $Cyclostomata$?

Select the incorrect statements with respect to Cyclostomes:
$(a)$ They lack scales and paired fins.
$(b)$ They have a circular mouth with jaws.
$(c)$ They bear $6-15$ pairs of gills.
$(d)$ They migrate to deep sea for spawning.
Choose the most appropriate answer from the options given below:

Lampreys are