The Mean Free Path for a Nitrogen Molecule in a Tank

Multiple Choice

The mean free path for a nitrogen molecule in a tank of dry nitrogen at 273 K is 0.15 $\mu$ m.If the diameter of a nitrogen molecule is 0.29 nm,what is the pressure in the tank?

A) 95.1 kPa
B) 48 kPa
C) 211 kPa
D) 299 kPa
E) 67.2 kPa