ANSWER
Wave A = Lowest volume with the lowest pitch
Wave B = Highest volume with the lowest pitch
Wave C = Lowest volume with the highest pitch
Wave D = Highest volume with the highest pitch
Step-by-step explanation
We want to attach the correct option to the correct figure.
From the question, the amplitude is proportional to volume, and frequency is given to be perceived as pitch.
On a wave graph, the amplitude is represented on the y-axis while the period is represented on the x-axis.
The relationship between period and frequency is an inverted relationship, which means that for a wave, the higher the period, the lower the frequency, and vice versa.
This means that from the figures given, we can conclude that:
Wave A = Lowest volume with the lowest pitch
Wave B = Highest volume with the lowest pitch
Wave C = Lowest volume with the highest pitch
Wave D = Highest volume with the highest pitch
That is the answer.