Answer:
Tobacco use is the single most preventable cause of disease, disability, and death in the United States.
Confort zone refers to the brunch of situations at which a specific individual feels comfortable. He/She knows perfectly how to act and react in that environment and it does not suppose a challenge to perform properly in these situations.
On the contrary, when someome steps out of the comfort zone starts to feel vulnerable, hesitates and needs to think many times about the next step in the path. But for many, like the users of the sentence "''life begins at the end of your comfort zone'' feeling the risk and achieving to overcome, is actually what makes you feel alive.
If the road is nearly empty, there wouldn’t be any traffic at all so I would say when the road is full of cars there is more racket :)
I think that the answer would be b if not try c
