To measure the wavelength of a wave, you typically find the distance between two successive points that are in phase with each other. This means measuring the distance between two consecutive peaks (crest to crest) or two consecutive troughs (trough to trough).
Without a visual or more detailed description of the wave, I can't definitively say which option is correct. However, if we assume that A, B, C, D, E, F, and G are points along the wave, the correct pair would be between two points that are the same phase in oscillation.
If you are able to identify which points correspond to successive peaks or troughs, you would select those points. If you provide further information about the wave, I could help determine the correct pair of points for measuring the wavelength.
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