As New Goods and Services Become Available, the Basket of Goods

As new goods and services become available, the basket of goods used to calculate the CPI:

A) immediately changes to reflect the new goods and services.
B) will change once 75 percent of urban consumers use the new goods and services.
C) does not change to reflect the new goods and services, in order to remain stable.
D) is periodically updated in order to reflect the new goods and services.