Brian grew into adulthood with the goal to have a family that didn't use violence to solve problems. some people said it was in his genes to naturally get angry, but brian learned to control it. he chooses to use his words to express his displeasure instead. which theory describes brian's choice to not use violence?

Brian chose to follow up a path of his own other than allow himself to actually succumb to what look to be a path where he'd be expected to use violence following the actual history of his family. People will always have control over his destiny and free will to choose. He chose to follow this instead of following through the cycle of hatred, which apparently is expected in his family

This is the answer: body 1 + engine 2