Calculate the mass of water in a bank of fog hovering over Beaverton on a moderately foggy day. Assume that the surface area of Beaverton is 53 km² and the fog reaches to an altitude of 100 m. On a moderately foggy day, the density of water vapor in air will be 5 x 10⁻⁸ g/cm³. A) 3 x 10³ g
B) 2 x 10⁴ g
C) 3 x 10⁸ g
D) 2 x 10⁹ g
E) 3 x 10⁶ g