A wave source is moving in harmonic motion, the amplitude is 0.02m, the frequency is 0.5Hz, the initial phase is π/3, and the wave propagates in the positive direction of the x axis at a speed of 300m/s. The displacement of t = 2/3 s ， x = 200m is
选项：

A:0.02m
B:0.01m
C:-0.02m
D:-0.01m