To determine the wavelength in a wave picture, you need to look for the distance between two consecutive points that are in phase (e.g., from crest to crest or trough to trough).
If you can provide me with a description of the wave picture or the relevant measurements, I'll be able to help you calculate the wavelength. Otherwise, based on provided response options, you should choose the one that reflects the distance between the repeating sections of the wave.
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