Final answer:
Proximity and similarity are the factors that explain Jenna's attraction to the man in the dorm room right across the hall from her.
Step-by-step explanation:
According to research, the most influential factor in determining the formation of relationships is proximity. People are more likely to be friends or form romantic relationships with individuals they have regular contact with. This is because having regular proximity to someone provides the opportunity to get to know them better.
In addition to proximity, another factor that influences relationship formation is similarity. People are more likely to be attracted to and form relationships with individuals who are similar to them in background, attitudes, and lifestyle. Sharing common interests and values makes it easier to establish connections and get along with others.
Physical attractiveness and reciprocal liking are also important factors in relationships, but they are not the primary explanations for Jenna's attraction to the man in the dorm room across the hall. Therefore, the correct answer to the question is a) Proximity.