Art Historian: Recently, computer analysis has revealed that a few of a famous Flemish artist`s works are forgeries, and are actually the work of noted forger Elmyr de Hory. While such a development may emit violent reverberations through the art world, even those museums that have a wealth of the Flemish artists in their collections should not be overly concerned. Hundreds of this Flemish artist`s works were tested to determine whether they were forgeries, yet only a slim few turned out to be actual forgeries. Thus, the master`s reputation as one of the greatest artists humanity has ever produced will surely remain undiminished. Which of the following, if true, casts the most doubt on the art historian`s conclusion?
【选项】Many of the Flemish artist`s well-known portraits are in the collection of private owners and were therefore not subjected to computer analysis.