When 4 L of He, 6 L of N₂, and 10 L of Ar, all at 0°C and 1 atm, are pumped into an evacuated 8 L rigid container, what is the final pressure at 0°C?
a) 0.5 atm
b) 1.0 atm
c) 1.5 atm
d) 2.0 atm