Under Standard Conditions, the Density of Air Is $1.29 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

Multiple Choice

Under standard conditions, the density of air is $1.29 \mathrm {~kg} / \mathrm { m } ^ { 3 }$ What is the mass of the air inside a room measuring $4.0 \mathrm {~m} \times 3.0 \mathrm {~m} \times 2.0 \mathrm {~m} ?$

A) 31 kg
B) 19 kg
C) 3.1 kg
D) 1.9 kg
E) 0.32 kg