The Mixing Ratio = Mass of Water Vapor (Grams)/ Mass

The mixing ratio = mass of water vapor (grams) / mass of dry air (kilograms) .So if you have 10 grams of water vapor in 100 kilograms of dry air,what is the mixing ratio?

A) 10 g/kg
B) 100 g/kg
C) 0) 1 g/kg
D) 0) 01 g/kg
E) 1 g/kg