Answer:
(C) utility
Explanation:
Utility is defined as the full satisfaction and the complete fulfillment of need received from consuming a good or service.
And the consumption of the first few units of any good tends to bring a higher level of utility to a person than consumption of later units. For instance, Mr A might board a vehicle to quickly make up with an appointment. But some other time, such rides might provide less utility, maybe to just save time.