Which Set of Gases Is Listed from Highest to Lowest $\circ$

Which set of gases is listed from highest to lowest root-mean-square speed at 25 ^$\circ$ C?

A) N₂O > C₂H₄ > HCl > Xe
B) Xe > HCl > C₂H₄ > N₂O
C) Xe > N₂O > C₂H₄ > HCl
D) Xe > N₂O > HCl > C₂H₄
E) C₂H₄ > HCl > N₂O > Xe