[单选题]
Figure 11-2 is a "snapshqdi+:qlqlv0 osy;l+4381lrmbs 5go cot" of a wave at a given time. gh gp9 p f)vf;vi6nn1. The frequency of the wave is 120 Hz. W)gv 9; vnnh6.p1igpff hat is the wavelength?
A. $0.05 \; m$
B. $0.10 \; m$
C. $0.20 \; m$
D. $0.30 \; m$
