A Mass Attached to a Horizontal Spring,and Resting on a Frictionless

A mass attached to a horizontal spring,and resting on a frictionless surface is free to oscillate back and forth.Suppose the spring is stretched a distance 2d from equilibrium,and released.As the mass passes through the origin,how does its speed compare to the same mass and spring if stretched initially only a distance d from equilibrium?

A) two times greater
B) two times smaller
C) square root of 2 times greater
D) square root of 2 times smaller