A drop in arterial pressure after a hemorrhage will be restored by:
A. Parasympathetic constriction of veins, resulting in increase blood flow into the arteries.
B. Sympathetic constriction of veins, resulting in increase blood flow into the arteries.
C. Parasympathetic dilation of veins, resulting in decrease blood flow into the arteries.
D. Sympathetic dilation of veins, resulting in increase blood flow into the arteries.