The HHI for automobiles is? 2,350, for sporting goods is? 161, for batteries is? 2,883, and for jewelry is 81.
The market for automobiles is? ______, and the market for sporting goods is? ______.
A. monopolistic? competition; an oligopoly
B. an? oligopoly; perfectly competitive
C. monopolistic? competition; monopolistic competition
D. a? monopoly; perfectly competitive