Humans Are Able to Differentiate Particular Pairs of Speech Sounds

Multiple Choice

Humans are able to differentiate particular pairs of speech sounds:

A) only if they are exposed to the sounds before they are about 8 months old.
B) if they are exposed to the sounds sometime during their childhood.
C) if they have a great deal of exposure to the sounds as an adult.
D) only if they are exposed to the sounds before they are born.