Answer :
"b They should start a political action committee and lobby for antismoking policies" would be the best way to pass anti-smoking legislation. Lawmakers must feel the pressure.
I believe the answer is: b They should start a political action committee and lobby for antismoking policies.
Through the political action committee, those group of people could help a certain representative to win the election, either through giving financial help or by promoting the candidate. In exchange, when the candidate is selected, the candidate would help to pass the legislation that wanted by the group of citizens.