When Comparing Cultures That Use Infant-Directed (ID) Speech to Those

When comparing cultures that use infant-directed (ID) speech to those that do not, it is clear that __________.

A) without infant-directed speech, one may see delays in language development
B) regardless of practice, language fluency develops for all infants within a few years
C) infant-directed speech greatly hampers language development
D) cultures that use infant-directed speech have an earlier onset of language development