The Price Index Was 150 in the First Year, 160

The price index was 150 in the first year, 160 in the second year, and 175 in the third year. The inflation rate was about

A) 6.25 percent between the first and second years, and 8.6 percent between the second and third years.
B) 6.7 percent between the first and second years, and 9.4 percent between the second and third years.
C) 10 percent between the first and second years, and 15 percent between the second and third years.
D) 60 percent between the first and second years, and 75 percent between the second and third years.