955 - Logical Reasoning

Question1 : Which of the following, if true, most serinously weakens the conclusion that cigarette companies could have dropped advertising without suffering economically?

1. Cigarette advertisements provide a major proportion of total advertising revenue for numerous magazines.
2. Cigarette promotion serves to attract first-time smokers to replace those people who have stopped smoking.
3. There exists no research conclusively demon-strating that increases in cigarette advertising are related to increases in smoking.
4. Advertising is so firmly established as a major business activity of cigarette manufacturers that they would be unlikely to drop it.
5. Brand loyalty is typically not very strong among those who smoke inexpensive cigarettes.