B. is your best answer
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The brain gets used to you taking the drug. Some drugs will affect your neurotransmitters, or messages that get sent to your brain that regulates how we think or feel. You will eventually become dependent on the drug so if you stop you might feel sick or go through "withdrawal". Which people dont want to go through so they will continue to take the drug.
Answer:
Boundaries. I have gave you anwer
Your role is to take care of your body because its the only on you have. Your responsibility is to make sure your body is getting the nutrition and vitamins it needs. Making sure you drink enough water and keep as many chemicals out of your body as you can is a huge key to health. taking care of your body's outsides are just as important as taking care of your body's outsides, as well.