You are more likely to develop a friendship with someone in one of your classes or someone who lives next door due to proximity.
What is proximity?
Proximity can simply be defined as how close or near is something to you.
Proximity to someone can make it possible to have a close relationship with the person or to interact with that person. A person is most likely to develop a rapport with his/her class mate because they are close to each other due to the fact that they are both in the class.
Therefore the statement that filled the gap is proximity.
Learn more about proximity here:https://brainly.com/question/80020
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