【单选题】The market for manufactured goods is what economists call 'imperfect,' because each company has its own style, its own reputation, and its own locations and all of the arts of advertisement and salesm...
A.
the distinctive style. of each company
B.
the attempts of advertisement to attract buyers to particular brand names
C.
tendency for the prices of the same goods to equalize quickly
D.
the freedom of small businesses to decide the prices they will charge