The answer is A, advocating for yourself means understanding what you have to do to stay/become healthy, and you cannot do that without understanding the instructions for your medication.
When visiting the doctor you should always be 100% clear on things like medication instructions or treatment options, this is for your own benefit, for your own health. The doctor is there to help you and you shouldn't be made to feel like you can't ask questions or bring up anything related to your health during the appointment.
