Factors Influencing Interpersonal Attraction

In the context of interpersonal attraction, several factors influence why individuals are drawn to one another. One widely recognized principle is the similarity-attraction hypothesis, which posits that people are more likely to form relationships with others who share similar characteristics or beliefs.

Consider the following scenario: Sarah, an undergraduate student, notices that she feels an affinity for certain classmates who share her interests in literature and environmental activism. This leads her to become friends with them and participate in activities they enjoy together.

Based on the principles of interpersonal attraction, which factor most strongly contributed to Sarah's attraction to her classmates?