Sally Is Selling Homemade Tamales in a Market Where Many

Sally is selling homemade tamales in a market where many other firms make and sell tamales and many people want to buy homemade tamales. Everyone knows about all of the other sellers, but they are willing to pay more for Sally's tamales because they have the tastiest fillings. Why is the market for tamales not perfectly competitive?

A) There aren't many sellers.
B) There is imperfect information.
C) There aren't many buyers.
D) There isn't a standardized product.