Which of the Following Gases Has the Highest Rms Velocity $\circ$

Which of the following gases has the highest rms velocity?

A) nitrogen molecules at 1 atm and 30 ^$\circ$ C
B) argon atoms at 1atm and 30 ^$\circ$ C
C) argon atoms at 2 atm and 30 ^$\circ$ C
D) oxygen molecules at 2 atm and 30 ^$\circ$ C
E) nitrogen molecules at 2 atm and 15 ^$\circ$ C