Which is true regarding infant-directed speech?
A. The tendency of mothers to speak to their infants is universal.
B. Children in low-socioeconomic homes are talked to more often than those in high-socioeconomic homes.
C. Adults can identify infant-directed speech, even when it is spoken in a language they do not speak.
D. The quality, but not the quantity, of mothers' speech has impact on the rate of vocabulary growth.
Answer: C
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