In the Upward-Sloping Segment of the Aggregate Supply Curve

In the upward-sloping segment of the aggregate supply curve:

A) increases in output are linked to decreases in the price level.
B) increasing prices drag down resource costs.
C) producers can hire more workers without having to raise the wage rate.
D) the economy can increase aggregate supply without prices going up.
E) firms are willing to pay higher wages to get more labour.