During an Assertiveness Training Group, a Client Admits to Aggressive

During an assertiveness training group, a client admits to aggressive behaviors. The client asks for suggestions for how to become more assertive and less aggressive. Which is the most appropriate nursing reply?

A) "Several techniques, including meditation and progressive muscle relaxation, appear helpful."
B) "There's not much that can be done about aggressive behavior because of biological responses."
C) "Certain types of medications have been proven effective in promoting assertive communication."
D) "There are several techniques, including 'I' statements and thought stopping, that promote assertive behaviors and decrease aggressive behaviors."