In Eimas Et Al's (1971) Study, 1- and 4-Month-Old Infants

In Eimas et al's (1971) study, 1- and 4-month-old infants responded to syllables whose initial consonant varied in its VOT value. The results of the study showed that:

A) neither group of infants was able to perceive the differences in the speech sounds
B) both groups of infants heard differences in speech sounds, but nether was able to organize them into speech categories
C) only the 4-month-olds were able to perceive differences in speech sounds and organize them into categories
D) both groups were able to perceive differences in speech sounds and organize them into categories