The comma attempts to join 2 independent clauses. B
The correct letter answer is A or C. Choose whichever one you want. I think it's C, but you can consider A also. :)
Heart. The reason behind this is harmful gases can cause many problems with the human body. It can effect the skin. Harming the skins natural barriers. It can harm the lungs. And your eyes are very soft. Your eyes cannot take that
D because it helps to get the thing that there choking on out of them
