A Liter Container of CO₂ and a Liter Container of H₂

A liter container of CO₂ and a liter container of H₂ are both at 25^oC and 1 atm pressure.Which of the following statements about these gas samples is true?

A) The CO₂ and H₂ molecules have the same average velocity.
B) There are more H₂ molecules than CO₂ molecules.
C) The average kinetic energy of the CO₂ molecules is greater than that of the H₂ molecules.
D) The CO₂ molecules on average are moving more slowly than the H₂ molecules.
E) The masses of the two gas samples are equal.