How many advantages of money are mentioned in this passage

A．you have to sell something in order to buy something
B．you have to buy something in order to sell something
C．you don't have to buy something in order to sell something
D．the seller and the purchaser are the same person

A．people can use their money to buy whatever they want
B．people do not need to make a complete product for exchange
C．people make a great contribution to the manufacture of a product
D．people cannot use their money to buy whatever they want