Which of the following is an example of sound waves diffracting?

Question

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shouting into a canyon and hearing your voice shout back at you.
hearing children playing outside through an open window.
a rainbow that appears after rainfall
hearing your friend say your name underwater at the pool

Answer 1

Shouting into a canyon and hearing your voice shout back at you.

Answer 2

worng

Answer 3

Hearing children playing outside through an open window is an example of sound waves diffracting.