To determine the amplitude of a wave, you need to look at the vertical distance from the rest position (middle of the wave) to the peak (crest) or trough of the wave. Since the specifics of the student's wave model are not provided here, based on the options given, if the peak height is 1m or the lowest point is -1m, then the amplitude would be 1m. If the peak height is 2m or -2m, the amplitude would be 2m, and similarly for 6m.
If the necessary information or visual representation of the wave isn't accessible, then the answer will be that "the amplitude cannot be determined."
Please check the wave diagram for the highest point (crest) and lowest point (trough) to ascertain one of the numerical values provided (1m, 2m, 6m) or confirm if the amplitude cannot be determined.