Answer:
mere-exposure effect.
Step-by-step explanation:
In social psychology, the phenomenon of mere-exposure effect pertains to the idea that humans tend to develop an attraction towards a stimulus merely because we are familiar with it.
Also known as familiarity principle, mere-exposure effect is developed on the basis of familiarity and regular encounter of a stimulus.
Here, George developing a liking towards Kiki at the end of the semester after regular encounter and familiarity with her is an example of mere-exposure effect.