Why Is the AS Curve Upward-Sloping

Multiple Choice

Why is the AS curve upward-sloping?

A) Because,since nominal wages increase when production rises,then so too must the price level.
B) A higher price means higher total profits and therefore firms will produce more.
C) Higher prices mean higher real wages and therefore firms must produce more to in order to maintain profit levels.
D) Higher prices increase the demand and therefore the quantity supplied must also increase.