Respuesta :

Answer:


Step-by-step explanation:

The answer is D.


A is the wavelength. As it says in its title, it shows the length of one complete wave.


B is the crest. This is the point in the wave where it's at its highest.


C is the trough. This is the point in the wave where it's at it's lowest.


And lastly, D is the equilibrium position. These are the points on the wave where they touch the equilibrium, or the horizontal line going through the wave.