In Hong Kong, drivers can buy tickets from tunnel companies for using tunnel services. These tickets is NOT a standard of deferred payment. In other words,
A. the purchasing power stored in the tickets can only be used for certain tunnel services.
B. most people in Hong Kong do not use the tickets for the tunnel services.
C. the value of most goods and services are not measured in terms of the tickets.
D. payment in the future in general is not denominated in the tickets.