ANSWER: C.Serotonin release from platelets
EXPLANATION:
Hemostasis is a process which causes bleeding to stop
it has 3 steps 1.vasoconstriction 2.platelet plug formation
3.blood coagulation or formation of fibrin clot
Vasoconstriction in which the smooth muscle in the vessel walls
undergo intense contractions and increases blood pressure of
affected vessel wall
if the vessels are small,spasms compress the inner walls
together and may able to stop bleeding completely which is
stimulated  by the platelets from
serotonin.
