When a Certain String Is Under Tension T, the Speed $\sqrt { 2 }$

When a certain string is under tension T, the speed of a wave in the string is v. What will be the speed of a wave in the string if the tension is increased to 2T without changing the mass or length of the string?

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