In the platelet release reaction?

In the platelet release reaction,
a. factor XII is activated
b. ADP and thromboxanes stimulate other platelets to become activated
c. activated platelets are connected by fibrinogen
d. prostaglandin production is inhibited
e. platelets convert to fibrin

On the diagram of RBC production, what does “A” represent?
a. increased blood oxygenb. decreased blood oxygenc. erythropoietin
d. kidney
e. red bone marrow

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