A) the economy is operating below full capacity in the short run, and will have to adjust by hiring more workers, thus reducing unemployment.
B) the price level is too high. The only way long-run equilibrium can be restored is to lower the price level.
C) adjustments will have to occur so that the long-run aggregate supply equals $12 trillion.
D) adjustments will have to occur so that the short-run aggregate supply intersects the aggregate demand curve at $10 trillion.