Darla is pregnant, and is in her third trimester.  She believes that her baby already recognizes the sound of her voice.  What methods have scientists used to determine if infants can actually hear and recognize their mother’s voices in utero?   Group of answer choices   A. They have measured changes in movement and heart rate to determine if infants can discriminate differences in pitch.   B. They rang bells close to pregnant women’s wombs in an attempt to startle the infants.   C. They had mothers read The Cat In The Hat to their infants in the last month of pregnancy, then had the newborns suck on special pacifiers that triggered different recordings of people reading the book to see which recording they preferred.   D. They’ve done all of these crazy things listed here to try to answer this question.

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