A Gaseous Mixture at a Total Pressure of 1

Multiple Choice

A gaseous mixture at a total pressure of 1.50 atm contains equal molar amounts of He, Ne, and Ar. At constant temperature CO₂ gas is added to the mixture until the total pressure is 3.00 atm. Which of the following is a correct statement concerning partial pressures after the CO₂ addition?

A) The partial pressure of Ar has doubled.
B) The partial pressure of CO₂ is three times that of Ne.
C) All four gases have equal partial pressures.
D) More than one correct response.
E) No correct response.