In 2011, Armenia Had a Real GDP of $4

In 2011, Armenia had a real GDP of $4.21 billion and a population of 2.98 million. In 2012, real GDP was $4.59 billion and population was 2.97 million. What was Armenia's economic growth rate from 2011 to 2012?

A) 0.38 percent
B) 9.0 percent
C) 3.8 percent
D) 8.3 percent