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Which frequency produces a sound that can be heard by a person? 

(A) 100 kHz 

(B) 40 kHz 

(C) 2 kHz 

(D) 30 kHz

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Which frequency produces a sound that can be heard by a person? 

(A) 100 kHz 

(B) 40 kHz 

(C) 2 kHz 

(D) 30 kHz

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