Art historian: This painting, purportedly by Mary Cassatt, is a forgery. Although the canvas and other materials are consistent with most of Cassatt's work, and the subject matter is similar to that of Cassatt's finest paintings, the brush style of this painting is not found in any work known to be Cassatt's. Hence this painting is definitely not a genuine Cassatt.
The art historian's argument depends on assuming which one of the following?
(A) The type of canvas and other materials that Cassatt used in most of her work were readily available to others. --
Even if it's not easily available forgerer will most probably find similar canvas(B) None of Cassatt's works is painted using a brush style that is not exhibited in any of her known works. --
Correct. All the art works depict similar brush style(C) Cassatt's work generally had a characteristic subject matter that distinguished it from the work of other painters of her era. --
Out of scope(D) The most characteristic feature of Cassatt's work is her brush style. --
Most characteristic? Too strong(E) No painter other than Cassatt would be able to match Cassatt's brush style perfectly. --
We certainly can't say that for sure