At 300K, what is the correct ordering (from slowest to fastest) of average molecular speed of the following gases: Ar, HBr, SO2, and CO2?
A) HBr < SO2 < CO2 < Ar
B) Ar < CO2 < SO2 < HBr
C) Ar < HBr < SO2 < CO2
D) HBr < CO2 < SO2 < Ar
E) All these gases have the same average speed at the same temperature