Which of the following statements is true about infant-directed speech?

A) Parents who use infant-directed speech are deliberately trying to teach infants to talk.
B) Infants are more easily bored by infant-directed speech than other forms of communication.
C) Most researchers advise parents to avoid using infant-directed speech, as it has been linked to language delays in early childhood.
D) Toddlers' first words and phrases are usually ones they hear often in their caregivers' infant-directed speech.

D