A Person Has Had an Accident and Is Bleeding Freely

A person has had an accident and is bleeding freely.Paramedics have arrived to stop the bleeding and are rushing the person to the hospital where a transfusion awaits.How is the body mobilizing extra blood from the blood reservoir to partially compensate until then?

A) Veins are undergoing massive vasodilatation to move blood back to the heart.
B) Veins are undergoing massive vasoconstriction to move blood back to the heart.
C) Arteries are undergoing massive vasoconstriction to move blood back to the heart.
D) Arteries are undergoing massive vasodilatation to move blood back to the heart.