"that kid is pleasant, but will lie about practically anything, even things that don't seem to matter much." this behavior most closely fits which pattern of conduct disorder?

The best answer to the question: This behavior most closely fits which pattern of conduct disorder, would be, the adolescent-onset of conduct disorder.

Explanation:

Conduct disorder is a mental disorder present in certain children and adolescents that can appear way before a child turns 10 years of age, in which case the disorder is known as childhood-onset conduct disorder, or after 10 years of age, in which case the disorder is known as adolescent-onset conduct disorder. It is believed that conduct disorder, if not treated in time and well, can lead to antisocial personality disorder. Since the kid in this case is not displaying aggression, cruelty, or disorder behaviors, but is rather calm but lying about everything, without caring, his symptoms point him more towards the adolescent-onset type of conduct disorder than the childhood-onset type.

answer; you can turn right on a red signal (when posted);