(A) Art speculators are unable to distinguish an inferior painting by Renoir from a masterpiece by him. (Incorrect: not relevant)
The argument is about the seller and the quality of the sale and the assumption is about classification but this option represents the point of viewers.
(B) All of the paintings that the board of trustee sells will be among those that the curator recommends selling. (Correct)
The assumption is removal of the painting will not affect the collection as they are not of superior quality and this option recommends the role of a curator who knows well about the quality hence it justifies the argument.
(C) All of the paintings by Renoir and Cezanne that are owned by the Federici Art Museum were purchased by Ms. Federici herself. (Incorrect: out of scope)
whoever purchases does not matter. The argument is about sales and revenue generation without hampering the quality.
(D) Only an avid collector of paintings by Cezanne would be willing to pay a high price for early works by this artist. (Incorrect: weaken)
This option hampers the revenue general as there is only one buyer
(E) A great work of art can be truly appreciated only if it is displayed in a carefully designed and well-maintained gallery. (Incorrect: out of scope)
Identification does not matter only assumption is a collection from low artwork