Natasha holds the two ends of a string in her hands and then moves her hands up and down so that a wave travels from one end of the string to the other end. In which case will she have a standing wave along the string?
A. The resultant wave rises and falls in amplitude over time and has a frequency equal to that of the waves.
B. The resultant wave has a fixed amplitude and a frequency twice that of the waves.
C. The resultant wave has a fixed amplitude and a frequency equal to that of the waves.
D. The resultant wave rises and falls in amplitude over time and has a frequency twice that of the waves.
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