Mouths of Petromyzon (lamprey) and Scoliodon are respectively:
a) Terminal (Petromyzon) and Suctorial (Scoliodon)
b) Suctorial (Petromyzon) and Terminal (Scoliodon)
c) Jawless (Petromyzon) and Terminal (Scoliodon)
d) Jawless (Petromyzon) and Ventral (Scoliodon)