When the Sea Lamprey (Petromyzon Marinus),a Marine Jawless Fish,was Moved

When the sea lamprey (Petromyzon marinus) ,a marine jawless fish,was moved in the ballast of ships from the Atlantic to the Great Lakes (a freshwater environment) the fish could more easily obtain oxygen from freshwater than it could in its native marine habitat.Why is this the case?

A) Freshwater has more oxygen than seawater.
B) Oxygen is more soluble in freshwater than in seawater.
C) Freshwater is colder than seawater.
D) Partial pressure of freshwater is higher than the partial pressure of seawater.
E) None of the above apply.