The question is based on the following information that is provided for country $x$ :

CPI and Nominal Income for Country X

$\backslash$table$[[$Year$,2000,2005,2010,2015],[$CPI$,85,92,100,105]]$

Nominal Income $($in Z $000)98543102543105987106876$

In which year was purchasing power highest in country $x?$

Select one:

a$.2000$

b$.2005$

c$.2010$

d$.2015$