Answer: .1) Bill, his roommate
Explanation:
Mere-exposure effect is defined as mechanism in which individual tend to prefer the people or things with whom they are familiar in psychological background and thus develop liking feeling towards it. The phenomena works on the principle of familiarity.
According to the question, Tom will face mere exposure effect towards Bill as he his familiar with him in the form of roommate who lives with him when he is far from home.
Other options are incorrect because John does not live in campus and thus Bill is not familiar with him. Stuart and Micheal are also the people with whom he cannot have a link as they have distant living from Bill. Thus, the correct option is option(1).
