There are an unknown number of moles of argon in a steel container. A chemist injects two moles of nitrogen into the container. The temperature and volume do not change, but the pressure increases by ten percent. Originally the container held:
A) 16 moles of Ar.
B) 18 moles of Ar.
C) 20 moles of Ar.
D) 22 moles of Ar.