Which of the Following Statements Is True About Child-Directed Speech

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

A) There is little cultural variation in the use of child-directed speech, with parents across cultures using this as the predominant style of communication.
B) Infants in all cultures prefer to listen to speech that has the characteristics of child-directed speech.
C) There is strong empirical evidence that children who hear more child-directed speech than others learn language faster.
D) There is strong empirical evidence that children who hear more child-directed speech as infants have better language skills as toddlers.