You Have a Friend Who Always Says "You Cannot Legislate

You have a friend who always says "you cannot legislate healthy living." You think that this is really not true,and point to the relationship between state-wide smoking bans and rates of heart attacks as evidence.What happens when a state or country bans smoking in public places? Rates of heart attacks decline by what percentage during the first year after the ban?

A) 5%,so your friend is
B) 10%,so your friend is
C) 30%,so you are
D) 50%,so you are