The Van Der Waals Equation of State for a Real

The van der Waals equation of state for a real gas is At what pressure will 1.00 mole of NH₃ be in a 10.00 L container at 298 K, assuming NH₃ is a real gas?(van der Waals constants for NH₃ are a = 4.170 L² atm mol^-2, b = 0.03707 L mol^-1)

A) 2.03 atm
B) 20.3 atm
C) 2.41 atm
D) 24.1 atm
E) 2.47 atm