Automobile Air Bags Inflate During a Crash or Sudden Stop $\rightarrow$

Automobile air bags inflate during a crash or sudden stop by the rapid generation of nitrogen gas from sodium azide.
2NaN₃(s) $\rightarrow$ 2Na(s) + 3N₂(g)
How many moles of sodium azide are needed to produce sufficient nitrogen to fill a 50.0 L air bag to a pressure of 1.25 atm at 25°C?

A) 2.56 mol
B) 3.83 mol
C) 5.31 mol
D) 1.70 mol
E) 4.92 mol