How has legislation limit the health risks of smoking?

legislation limit the health risks of smoking by "creating laws." the legislative created laws such as "how people can't smoke in public eating areas and if they do they have to be at least 5 metres away from the restaurant entrances" to keep people from getting second hand smoke, although some restaurants prohibited smoking most of them continue to follow the laws to limit health risks.

hope this .

i think the answer would be b.