What Is the Evidence That There Is a Genetic Link

What is the evidence that there is a genetic link to aggression?

A) Drugs used to treat attention deficit hyperactivity disorder typically also reduce aggressive behavior in children.
B) Children who have high levels of testosterone tend to have lower self-esteem and commit more crimes as adults.
C) Adoption studies show that the biological children of criminals commit more crimes than the biological children of non-criminals.
D) There is a greater agreement rate for criminal behavior between identical twins than fraternal twins.