Advertisement: Northwoods Maple Syrup, made the old-fashioned way, is simply tops for taste. And here is the proof: in a recent market survey, 7 out of every 10 shoppers who expressed a preference said that Northwoods was the only maple syrup for them, no ifs, ands, or buts. Of the following, which one is the strongest reason why the advertisement is potentially misleading? ['The proportion of shoppers expressing no preference might have been very small.', 'The preference for the Northwoods brand might be based on such a factor as an exceptionally low price.', 'Other brands of maple syrup might also be made the old-fashioned way.', 'No market survey covers more than a sizable minority of the total population of consumers.']