Christina is a single mother of two children. She grew up in a home filled with violence. Her mother was frequently high on crack cocaine as Christina entered her teen years. Christina's dad has not been a part of her life since she was four years old. She vowed to herself that she would never allow her children to be raised as she was. Christina married her high school boyfriend and had a son and a daughter. She worked as a nursing assistant and life was going well for her until her husband left her for a man. Christina fell into massive depression that was only relieved with alcohol and illegal drugs. She started selling drugs and engaging in prostitution to maintain her habit but was arrested by an undercover officer. She is currently serving a six-year prison sentence. After her release from prison, Christina eventually moved to an upscale neighborhood and began a committed, stable relationship. She is now a different person and has no interest in crime. Which major theory of criminality would best explain this change?