A mass of 0.40 kg, hanging from a spring with a spring constant of 80 N/m, is set into an up-and-down simple harmonic motion. What is the speed of the mass when moving through a point at 0.05 m displacement? The starting displacement of the mass is 0.10 m from its equilibrium position.( )
选项：

A:zero
B:1.4 m/s
C:1.7 m/s
D:1.2 m/s
E:1.0 m/s