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As the frequency decreases, the amplitude of the wave also decreases. Therefore, the slope (extent of change) decreases as the waves are broadened/more spread out. Think of the extent of change as a derivative (slope) and compare a wave with high frequency to a wave with low frequency.
The question is confusing because the "extent of the change" is a really weird way of saying the slope of the graph. It wants you to see what would happen to the slope of the wave when freq decreases (wavelength increases) and therefore slope decreases (less steep). Its just a poorly worded question.
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