Each of the Lungs Holds 2 $l$ Of Air at the Physiological Temperature of 37^oC

Multiple Choice

Each of the lungs holds 2.0 $l$ of air at the physiological temperature of 37^oC. The number of moles of air in the lungs (where the gauge pressure is 21 kPa) is

A) 1.9 $\times$ 10^-3.
B) 1.9 $\times$ 10^-1.
C) 1.9.
D) 1.9 $\times$ 10³.
E) 1.6 $\times$ 10⁶.