Interpersonal attraction is a critical component in understanding social relationships and influences how individuals connect with one another. A key element in determining whom we are attracted to revolves around the attraction-similarity hypothesis, which posits that people tend to form relationships with others who are similar to themselves. However, what other factors may also significantly affect interpersonal attraction? Which of the following theories or concepts aligns with the explanation of heightened attraction under specific conditions such as physical proximity and the mere exposure effect?