An inCrEAsE in thE gEnErAl lEvEl oF priCEs oF proDuCts AnD sErviCEs ovEr A spECiFiED pErioD oF timE is CAllED ______
A、inFlAtion.
B．stAgFlAtion.
C．unEmploymEnt.
D．DisinFlAtion.
E．EquiliBrium.