Lucy has discovered that when she finishes her bottle, her father cuddles with her. Lucy’s parents have noticed that she sucks faster on her bottle when her father is in the room. What behavior is Lucy displaying?

Classical conditioning

Explanation:

Classical conditioning: In psychology, the term "classical conditioning" is also referred to as "Respondent conditioning or Pavlovian conditioning". It is described as specific learning that occurs through the connection or association process and was proposed by a Russian psychologist named Ivan Pavlov. In other words, two different stimuli are being linked with each other in order to produce an entirely new learned response in a particular animal or an individual.

In the question above, an association is being made between Lucy's finishing the bottle and her father hugging her, therefore, Lucy is displaying classical conditioning.