Christina Is a Single Mother of Two Children

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 she entered her teen years.  Christina's dad has not been the part of her life since she was 4.  She vowed to herself that she would never allow her children to be raised in a home like she grew up in.  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 another woman.  Christina fell into massive depression that was only relieved with alcohol and other illegal drugs.  Christina started selling drugs and engaging in prostitution to maintain her habit until she was arrested by an undercover officer.  She is currently serving a 6-year prison sentence.
Christina's depression played a significant part in her criminal lifestyle.  Which theory best explains this and why this is so?

A) Gender explanations
B) Life course explanations
C) Sociological explanations
D) Psychological explanations