Bill, Who Was Forced to Swallow Chewing Tobacco as Punishment

Bill, who was forced to swallow chewing tobacco as punishment for chewing it in the boys' bathroom at high school, gets very angry thinking about the incident. He decides to confront the school's principal after a few days, and the discussion gets very heated. During the course of confrontation, Bill strikes the principal with his fist, resulting in the death of the principal. Bill is arrested and now stands trial for murder.

A) Bill's defense attorney argues the death penalty should not be imposed due to Bill's history of abuse at home. The circumstances described are ______ circumstances. ​
B) aggravating
C) mitigating
D) random and capricious
E) arbitrary and illogical