A Sample of an Ideal Gas Is Heated and Its $4 v$

Multiple Choice

A sample of an ideal gas is heated and its Kelvin temperature doubles. If the root-mean-square speed of its molecules was originally v, what is the new root-mean-square speed?

A) $4 v$
B) $v / \sqrt { 2 }$
C) $v \sqrt { 2 }$
D) $v / 4$
E) $2 v$