All of the Following Statements About Infant-Directed (ID) Speech Are

All of the following statements about infant-directed (ID) speech are supported by research except

A) infants prefer ID speech over adult-directed speech, even if it is presented in a language that they have not previously heard
B) infants' preference for ID speech is limited to spoken language, unless they and their parents are both deaf and have been communicating only with sign language
C) ID speech may function like a set of introductory language lessons for young infants by exaggerating categorical differences between speech sounds
D) infants' preference for ID speech may reflect the fact that it focuses on emotional communication more than AD speech does