The diagram below shows various positions of a child in motion on a swing. Somewhere in front of...

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The diagram below shows various positions of a child in motion on a swing. Somewhere in front of the child a stationary whistle is blowing. At which position will the child hear the highest frequency for the sound of the whistle?
(1) At B when moving toward A.
(2) At B when moving toward C.
(3) At \( \mathrm{C} \) when moving toward \( \mathrm{B} \)
(4) At C when moving toward D.
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