Advertisement: A leading economist has determined that among people who used computers at their place of employment last year, those who also owned portable ("laptop") computers earned 25 percent more on average than those who did not. It is obvious from this that owning a laptop computer led to a higher-paying job. Which one of the following identifies a reasoning error in the argument? ['It offers information as support for a conclusion when that information actually shows that the conclusion is false.', 'Its conclusion merely restates a claim made earlier in the argument.', "It concludes that one thing was caused by another although the evidence given is consistent with the first thing's having caused the second.", 'It attempts to support a sweeping generalization on the basis of information about only a small number of individuals.']