After moving to a new apartment building, research suggests that sam will be most likely to become friends with
his next door neighbor
someone who lives three floors up in the apartment building
someone from across the street
his new postal delivery person

his next door neighbor

Explanation:

Research suggests that because of proximity, it is easier to make friends with the neighbor next door. This is because neighboring neighbors are seen more often and begin to relate more easily.

Whether living at home or apartment, living with those who live next door can be a good or bad relationship, depending on the respect and empathy between the parties, but it is favorable that living together is good, because it is always important to have friends around , especially when you just moved out.

answer; humanistic;