A Good or Service Becomes Scarcer Over Time If

A good or service becomes scarcer over time if

A) the difference between quantities demanded and supplied at a zero price decreases.
B) the excess of the quantity demanded over the quantity supplied at a zero price increases.
C) the economy is capable of producing more goods and services.
D) people begin to reduce their requirements for the goods and services that are actually available.
E) the amount of a good available equals the amount desired.