Carly is watching television and notices that she has seen the same commercial four times during the same program. she wonders why a company would pay for so many identical advertisements, so it seems she is unfamiliar with the

She is unfamiliar with the "mere exposure effect."

Explanation:

When an individual hear or see something many times, he/she develops a preference for that thing merely, the reason is that an individual is so much familiar with that, this phenomenon is known as mere-exposure effect. Sometimes we also develop that effect when we watch any tv program so many times that we develop much familiarity with that program.