A Market Is Initially in a Long-Run Equilibrium and There

A market is initially in a long-run equilibrium and there is a permanent increase in demand. After the new long-run equilibrium is reached, there

A) are the same number of firms in the market.
B) is no change in the market.
C) are fewer firms in the market.
D) are more firms in the market.
E) probably is a different number of firms in the market, but more information is needed to determine if the number of firms rises, falls or perhaps does not change.