Officials Estimate That the Eruptions of Mount St

Officials estimate that the eruptions of Mount St.Helens in 1980 released roughly 2.4 million cubic yards of ash having a mass of about 820 million kilograms.What was the approximate density of the ash? (1 yd = 0.9144 m)

A) 0.045 g/cm³
B) 0.45 g/cm³
C) 0.0450 g/cm³
D) 2.2 g/cm³
E) 0.22 g/cm³