There are two and half wavelengths, separate point A and point B. The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
What is wavelength ?
The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is calculated as;
[tex]\lambda= 1+1+\frac{1}{2} \\\\ \lambda =2.5[/tex]
There are 2.5 wavelengths, separate point A and point B.
Hence, option D is correct.
To learn more about the wavelength, refer to the link;
brainly.com/question/7143261
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