What is the self-perpetuating cycle in conduct disorder?

a. A genetic predisposition leads to a low IQ and difficult temperament, which leads to poor parenting and an insecure attachment, which leads to conduct disorder.
b. A genetic predisposition leads to a difficult temperament, which leads to behavior problems, which lead to parental overindulgence and lack of discipline, which leads to conduct disorder.
c. A genetic predisposition leads to an easy temperament but because of abusive parents, this leads to depression which in turn leads to conduct disorder.
d. A genetic predisposition leads to an easy temperament, which leads to parental neglect, which leads to anxiety, which leads to conduct disorder.

a. A genetic predisposition leads to a low IQ and difficult temperament, which leads to poor parenting and an insecure attachment, which leads to conduct disorder.