Hydrogen Consists of Two Isotopes ¹H and ²H with Atomic

Hydrogen consists of two isotopes ¹H and ²H with atomic masses 1.007 and 2.014 respectively. If gaseous ¹H₂ is to be separated from gaseous ²H₂ by gaseous diffusion what is the ratio of effusion rates of the gaseous forms of the isotopes?

A) 2.22
B) 1.41
C) 1.00
D) 3.86
E) 1.61