According to the passage, American babies sucked on their pacifiers more times
_____.
(A) upon hearing Swedish vowels than English vowels.
(B) when the sounds were a mixture of Swedish and English vowels.
(C) when the pacifiers were connected to a sound-generating computer.
(D) when the sounds they heard were from the headphones than when the
sounds were said by their parents.
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New babies eat, slee...