Suppose Nominal GDP for an Economy Rose from $125 Billion

Suppose nominal GDP for an economy rose from $125 billion in 2016 to $175 billion in 2017 and that the inflation rate over the same period was 5 percent.
-Refer to the information above to answer this question.By what percentage did real GDP increase between 2016 and 2017?

A) 5%
B) 15%
C) 25%
D) 35%
E) 45%