Engineers are investigating the suitability of Wantastiquet Pass as the site of a new bridge. Because one concern is whether erosion could eventually weaken the bridge' s foundations, they contracted for two reports on erosion in the region. Although both reports are accurate, one claims that the region suffers relatively little erosion, while the other claims that regional erosion is heavy and a cause for concern. Which one of the following, if true, most helps to explain how both reports could be accurate? ['One report cost nearly twice as much to prepare as did the other report.', 'One report focuses on regional topsoil erosion, while the other report focuses on riverbank erosion resulting from seasonal floods.', 'One report was prepared by scientists from a university, while the other report was prepared by scientists from a private consulting firm.', 'Both reports include computer-enhanced satellite photographs.']