According to the passage, what is the characteristic of a private-enterprise economy

A．If the product is in short supply compared with demand, the producers are unlikely to increase its production.
B．Producing more of a commodity results in elimination of parts of goods.
C．Consumers' demands actually control the 'price of the commodity.
D．Price may reflect the relationship between supply and demand directly.

A．They were mealy athletic festivals.
B．They were in the nature of a national event with a strong religious color.
C．They had roles which put foreign participants in a disadvantageous position.
D．They were primarily a national event with few foreign participants.