Final answer:
Waves 1 and 4 in the diagram have the greatest amplitude.
Step-by-step explanation:
The diagram represents 4 transverse waves travelling in the same medium. To determine which waves have the amplitude, we need to look at the distance between the equilibrium position and the crest or trough of each wave. The waves with the highest crest and lowest trough have the greatest amplitude. In the given diagram, waves 1 and 4 have the greatest amplitude.