Which of the following statements is supported by research on infant-directed speech (IDS)?
A) Deaf parents use a style of communication similar to IDS when signing to their deaf babies.
B) By as early as 2 months, infants are more emotionally receptive to IDS.
C) Infants do not begin to prefer IDS over other kinds of adult talk until age 2.
D) Parents who use IDS are careful to always use utterances of the same length.
Answer: A
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