The conduct disorder is more common in males than females (6-16% in males and 2-9% in females) , and shows up in social behaviors such as lying, theft, violence, aggression, and vandalism. Conduct disorder is a type of childhood psychological disorder. There are two types of conduct disorder: childhood-onset type, which appears before age 10 and adolescent-onset type., which is milder, with no exhibiting symptoms before age 10. Correct answer: C