The diagram shows a wave.
Which row is correct?

1 )
amplitude of the wave / cm:1.0 / wavelength of the wave / cm:4.0
amplitude of the wave / cm:1.0 / wavelength of the wave / cm:8.0
3 )
amplitude of the wave / cm:2.0 / wavelength of the wave / cm:4.0
4 )
amplitude of the wave / cm:2.0 / wavelength of the wave / cm:8.0
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