An Infant's Ability to Discriminate Between Sounds Can Be Detected

An infant's ability to discriminate between sounds can be detected by

A) measuring the amount of time it takes him or her to habituate to a novel sound.
B) a decrease in sucking after the presentation of a novel sound.
C) an increase in sucking after the presentation of a novel sound.
D) eye-movement decreases at the onset of sound.
E) head-movement increases at the onset of sound.