A Sample of an Ideal Gas Is Heated and Its $\sqrt { 2 }$

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