A Perfectly Competitive Market,with No External Economies or Diseconomies,is Initially

A perfectly competitive market,with no external economies or diseconomies,is initially in long-run equilibrium.There is a permanent increase in demand.After adjustment to the new long-run equilibrium

A) the remaining firms in the market will each be producing more output than previously.
B) the remaining firms in the market will each be producing less output than previously.
C) the remaining firms in the market will each be producing the same output as previously.
D) the remaining firms in the market may each be producing more output than previously, depending on the size of the change in demand.
E) the remaining firms in the market will each be producing either the same or more output than previously.