What is the earliest and quickest response of blood vessels after an injury? () A: Vascular endothelial cell contraction B: Platelet aggregation C: Clot retraction D: The wound callus E: Blood flowing retarding

What is the earliest and quickest response of blood vessels after an<br/>injury?() A: Vascular endothelial cell contraction B: Platelet aggregation C: Clot retraction D: The wound callus E: Blood flowing retarding