Which of the following is a characteristic of perfectly competitive markets?
A. The barriers to new firms entering the market will be natural ones.
B. There will be many firms in the market selling a differentiated product.
C. There will be no barriers to new firms entering the market.
D. There will be many buyers but only a few firms, all of whom will charge the same price.
E. There will be only a few buyers but many firms, all of whom are small relative to the market.