At standard temperature and pressure, a 1.00-mol sample of argon gas is vented into a 22.4-L rigid box that already contains 1.00 mol of nitrogen gas. We would expect the argon gas to 

a. decrease the total gas pressure in the box by 50%. 

b. occupy the entire 22.4-L volume of the box. 

c. increase the total gas pressure in the box by less than 50%. 

d. spread out into the box, but the actual volume occupied by the gas cannot be known without pressure information. 

e. occupy only a volume of 11.2 L of the box, since there is already 1.0 mol of nitrogen present in the container.