Consider Two Ideal Gases,A and B,at the Same Temperature

Multiple Choice

Consider two ideal gases,A and B,at the same temperature.The rms speed of the molecules of gas A is twice that of gas B.How does the molecular mass of A compare to that of B?

A) The molecular mass of A is twice that of B.
B) The molecular mass of A is one half that of B.
C) The molecular mass of A is 1.4 times that of B.
D) The molecular mass of A is one fourth that of B.
E) The molecular mass of A is four times that of B.