Babies Lose the Ability to Distinguish Vowels That Do Not

Babies lose the ability to distinguish vowels that do not occur in the language they are hearing by ________ of age and the ability to discriminate nonheard consonant contrasts by ________ of age.

A) three months; six months
B) nine months; one year
C) six months; nine months
D) six months; one year
E) one year; two years