Which one of the following best expresses the author's main point? A. The faking of art has occurred throughout history and in virtually every culture. B. Whether a work of art is fake or not is less important than whether it has artistic merit. C. It is possible to show that a work of art is fake, but the authenticity of a work cannot be proved conclusively. D. A variety of circumstances make it difficult to determine whether a work of art can appropriately be called a fake. E. Without an international market to support it, the faking of art would cease.