Suppose You Perform an Experiment in Which You Allow a Group

Suppose you perform an experiment in which you allow a group of babies to suck on one of two different pacifiers. Some babies sucked on the one that was smooth and round and other babies sucked on the pacifier that had ridges on it and was oblong. Later, you show both pacifiers to the babies and observe how long they look at each. An experiment such as this would most likely be performed to study which of the following topics?

A) sensory integration
B) classical conditioning
C) habituation
D) operant conditioning