Final answer:
The sentence is an example of forming a friendship based on proximity.
Step-by-step explanation:
The given sentence, 'Manes best friend lives across the street from her, and the 2 friends spend most of their free time together,' is an example of forming a friendship based on proximity. Proximity refers to the physical closeness or nearness of individuals, and it plays a significant role in determining with whom we become friends. In this example, Manes and her friend live across the street from each other, which makes it convenient for them to spend a lot of time together.