The answer is B I took the test a while back
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Most likely the answer is B.
Use the equation in the physics reference sheet. You can use the distance formula
Answer:
At point A. it gets kinda loud then at point B. it gets very loud than at point C. it gets quieter than at point D. it gets more silent.
Explanation:
Because you can tell when the waves get large it gets louder and then when the waves get more far apart then it get more quiet. Hope this helped!