The answer is D. Choosing a protein supplement.
It is the only action that can be completed effectively and safely. Diagnosing a disease through internet resources can be dangerous and people misdiagnose themselves causing panic and worry. The best way to diagnose a health problem is to speak to your doctor. Choosing an antidepressant is something only a professional medical practitioner can do. You cannot treat an eating disorder online, an eating disorder is a mental health condition and needs the right kind of treatment through psychological and medical support.