Which of the following pairs of values of the consumer price index (CPI) is consistent with an inflation rate of 2 percent from 2020 to 2021?

A. CPI in 2020 = 100; CPI in 2021 = 105 .2
B. CPI in 2020 = 90; CPI in 2021 = 94.2
C. CPI in 2020 = 110; CPI in 2021 = 107.8
D. CPI in 2020 = 110; CPI in 2021 = 112.2