A Client Diagnosed with Bipolar Disorder Says,"I Don't Understand Why

A client diagnosed with bipolar disorder says,"I don't understand why I go back and forth between being manic and being sad and depressed." Which explanations should the nurse offer?

A) "When you are getting too many chemicals in your brain,you have manic spells."
B) "When you don't take your drug,you get sick."
C) "The chemicals in your brain get all mixed up."
D) "When you do not get enough of certain chemicals in your brain,you feel depressed."
E) "When you can't control your mania,you use up so much energy that you crash and become depressed."