Politician: Members of the national legislature have received a very large number of phone calls and letters from people wanting to express their opinions about the new bill before the legislature, which would increase the current tax on bidis and cigarettes by one rupee per pack to pay for new antismoking advertisements. Since a great majority of these people expressed opposition to the bill, it is clear that the public overwhelmingly opposes this tax increase. Which one of the following, if true, most seriously weakens the argument? ['People who oppose a tax bill are far more likely to contact a legislator to express their opinions than are those who do not oppose the bill.', 'People who do not smoke bidis or cigarettes but work in tobacco-related industries are just as likely as smokers to oppose a bidi and cigarette tax.', 'Most antismoking advertisements are currently paid for by private organizations rather than being funded by taxes paid to the government.', 'Increasing the tax on bidis and cigarettes by one rupee per pack would reduce bidi and cigarette consumption so that total revenue from such taxes would not increase.']