I think the answer for the question is C) Use of illegal drugs.
Hope this helps!
Answer: i dont understand this question.
Explanation:
<em><u>THE</u></em><em><u> </u></em><em><u>TEACHER</u></em><em><u> </u></em><em><u>WILL</u></em><em><u> </u></em><em><u>MODEL</u></em><em><u> </u></em><em><u>HEATHFUL</u></em><em><u> </u></em><em><u>LIVING</u></em>
The main organ of the respiratory system is the lungs.