In the "Classical" Region of the Aggregate Supply Curve

In the "classical" region of the aggregate supply curve,

A) because there are substantial amounts of unemployed resources,output can be increased without driving up prices.
B) the economy is at the maximum output level,so only the composition of output can be changed,the quantity of output cannot be increased.
C) the economy is on the production possibilities frontier.
D) attempts to expand output will result in increases in both prices and output.
E) the economy is at the maximum output level,so only the composition of output can be changed,the quantity of output cannot be increased AND the economy is on the production possibilities frontier.