In the Economy of Ukzten in 2010, Consumption Was $4000

In the economy of Ukzten in 2010, consumption was $4000, exports were $800, GDP was $9500, imports were $200, and investment was $1000. What were Ukzten's government purchases in 2010?

A) $3700
B) $3900
C) $5100
D) $5500