Answer:
(B) The quality of an art collection is determined not just by the quality of its paintings, but by what development of the artistic talent and ideas of the artists represented.
Step-by-step explanation:
Any statement that weakens the argument is one that asserts that the artwork by Renoir and Cezanne may have some sort of value, and if sold will decrease the value of the collection.
Option B clearly indicates that the quality of an art collection is determined not just by the quality of its paintings, but by what development of the artistic talent and ideas of the artists represented. This is an indication or factor to consider whether the works by Renoir and Cezanne is actually valueless.