When Lungs Evolved in Vertebrates,an Event Also Occurred in the Circulation

When lungs evolved in vertebrates,an event also occurred in the circulation of blood within those vertebrates.The event was

A) the evolution of double circulation.
B) the evolution of red blood cells which could carry more oxygen.
C) the evolution of a lymphatic system to work in coordination with the circulation system.
D) the evolution of muscles that could coordinate a pumping action.
E) the evolution of a more fluid blood,that is a blood with more plasma.

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