If the Arterial Blood Pressure in the Brain Is Suddenly

If the arterial blood pressure in the brain is suddenly decreased,the flow through arterioles in the brain will immediately fall and then which of these will occur next?

A) Brain arterioles will constrict to accelerate blood flow through the brain capillaries.
B) Brain arterioles will dilate due to a decrease in levels of CO₂.
C) Blood flow will remain at the new,lower level due to reactive hyperemia.
D) Blood flow will rise to levels above normal due to excess O₂ levels.
E) Blood flow will return toward its original level due to flow autoregulation.