In a perfectly competitive market, sellers _________ and buyers _________.
A. are able to charge more than the market price; cannot pay less than the market price.
B. are able to charge more than the market price; are able to pay less than the market price.
C. cannot charge more than the market price; are able to pay less than the market price.
D. cannot charge more than the market price; cannot pay less than the market price.