William and Carrie go to the local Farmers Market every Saturday morning. The market attracts many consumers and has many vegetable stands, many flower stalls, many artisan craft stalls selling handmade soaps and scented oils, and many stalls selling yard ornaments. All of the sellers within a sales category (vegetables, flowers, artisan crafts, and ornaments) sell their goods for essentially the same price, with little variation. Carrie comments to William that the vegetable stands enjoy perfect competition. What factors did she take into consideration when making this comment?

a. She is considering that the vegetables are in perfect condition so the competition should also be perfect.

b. She is considering that vegetables, flowers, and crafts are different products and thus one could not be substituted for another so the vegetable stands are in a perfect location with a perfect market to sell their produce.

c. She is considering that there are many sellers and few buyers so the sellers set their own perfect price.

d. She is considering that there are many buyers and sellers of a product and no single buyer or seller is powerful enough to affect the price of that product.