Auditory Localization, the Ability to Detect the Source of Sounds

Auditory localization, the ability to detect the source of sounds,

A) improves steadily from birth to the age of about 6 months
B) cannot be tested in infants younger than 3 months
C) functions from birth for the human voice but not for other sounds until the age of about 6 months
D) appears to undergo a U-shaped developmental change from birth to about 6 months of age