Which of These Factors Is Most Important in Matching the Blood

Which of these factors is most important in matching the blood flow through a specific tissue with the metabolic needs of that tissue?

A) Sympathetically induced vasoconstriction of the arteries supplying a tissue forces more blood to flow into that tissue.
B) Parasympathetically induced vasodilation of the capillaries within a tissue allows more blood to flow into that tissue.
C) Local changes within a tissue resulting from increased metabolic activity can produce local arteriolar vasodilation to allow more blood to flow into that tissue.
D) Widespread venous vasoconstriction allows blood to dam up at the tissue level.