Hostile aggression differs from instrumental aggression in that instrumental aggression a) is more destructive than hostile aggression. b) involves inflicting pain as a means to an end. c) is more likely to result in retaliation. d) often follows from anger or frustration. e) usually involves inflicting only psychological pain, and not physical pain

involves inflicting pain as a means to an end.

Explanation:

According to my research on studies conducted by behaviorists, I can say that based on the information provided within the question the main difference between these two aggression is that Instrumental aggression involves inflicting pain as a means to an end. In other words it is aggression shown in order to achieve a certain goal.

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The purpose for including the affair was to have character development in the story. Abigail was willing to do anything, including the attempt to try and kill Goody Proctor in order to obtain John. This also made the foundation of Abigail, Goody Proctor, and John and how they were all significant in story development. If the writer had left of the detail of the affair, we wouldn't know why Abigail was trying to get rid of Elizabeth unless we made blind assumptions.