Each of the following, if true, would weaken the conclusion above EXCEPT: A. The value of a piece of art is purely subjective. B. Serious art collectors usually publicize their new artwork several months after making a purchase. C. Museums own the vast majority of the world's most valuable artwork. D. Of all the individuals in the world who own extremely valuable artwork, only a few are considered serious art collectors. E. The private collections of most serious individual art collectors are often displayed in public settings.