Fantz' Preference Method Is a Powerful Technique Used to Study

Fantz' preference method is a powerful technique used to study a host of issues concerning infant vision. What is true about the preference method?

A) It measures heart or respiration rates of babies looking at a pair of visual stimuli.
B) It takes advantage of the fact that babies can be operantly conditioned to turn their heads.
C) It involves presenting stimuli one at a time and then comparing looking times toward each.
D) It involves presenting two visual stimuli simultaneously and then comparing looking times toward each.