What Is the Relationship Between Oppositional Defiant Disorder and Conduct

What is the relationship between oppositional defiant disorder and conduct disorder?

A) Children who develop conduct disorder often have oppositional defiant disorder first.
B) Almost every case of oppositional defiant disorder develops into conduct disorder.
C) Before children develop oppositional defiant disorder,they have conduct disorder.
D) Children who develop conduct disorder almost never had oppositional defiant disorder.