Oxygen Molecules Are 16 Times More Massive Than Hydrogen Molecules $1 / \sqrt { 2 }$

Multiple Choice

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, how do their average molecular speeds compare? The oxygen molecules are moving

A) four times faster than the hydrogen molecules.
B) at 1/4 the speed of the hydrogen molecules.
C) at 1/16 the speed of the hydrogen molecules.
D) sixteen times faster than the hydrogen molecules.
E) at $1 / \sqrt { 2 }$ the speed of the hydrogen molecules.