According to the relationship between frustration and aggression, who is most likely to get into an argument with someone who cuts in line ahead of him or her

Considering the Frustration Aggression hypothesis the person who would be most likely to get into an argument who cuts in line ahead of the subject of study would be: the person who is ahead of the subject of study.

Explanation:

to understand this answer we have to analyze that the proposal from the frustration Aggression hypothesis settles that if a person gets blocked when she or he tries to accomplish an objective it will most likely drive them to a confrontation to stop the blocking factor for stealing them the opportunity o accomplishing their goal. Thus, if a person is waiting in a line, his or her objective is to execute her or his turn to reach his goal. However, if someone wants to cut line ahead of them it will block their chance to accomplish it instead of a person cutting line after them because he or she is worried about accomplishing her or his goal not equality of access for everyone.