The reference base period for the CPI is $1982-1984.$

In January $2015,$ the CPI was $233\mathrm{.}7.$

What does this number tell us$?$

This number tells us that the of the prices paid by urban consumers for a fixed basket of consumer goods and services was

A$.$ average; $233\mathrm{.}7$ percent higher in January $2015$ than the average of $1982-1984$

B$.$ inflation rate; $133\mathrm{.}7$ percent per year

C$.$ inflation rate; $233\mathrm{.}7$ percent per year

D$.$ average; $133\mathrm{.}7$ percent higher in January $2015$ than the average of $1982-1984$