求助一道逻辑题，好心人帮帮忙啦

GalenKwok

When storing Renaissance oil paintings, museumsconform to standards that call for careful control of the surroundingtemperature and humidity, with variations confined within narrow margins.Maintaining this environment is very costly, and recent research shows thateven old oil paint is unaffected by wide fluctuations in temperature andhumidity. Therefore, museums could relax their standards and save money withoutendangering their Renaissance oil paintings.
Which of the following is an assumption on whichthe argument depends?
A.     Renaissancepaintings were created in conditions involving far greater fluctuations intemperature and humidity than those permitted by current standards.
B.     Under thecurrent standards that museums use when storing Renaissance oil paintings,those paintings do not deteriorate at all.
C.     Museumcollections typically do not contain items that are more likely to bevulnerable to fluctuations in temperature and humidity than Renaissance oilpaintings.
D.     None of thematerials in Renaissance oil paintings other than the paint are vulnerableenough to relatively wide fluctuations in temperature and humidity to causedamage to the paintings.
E.      MostRenaissance oil paintings are stored in museums located in regions near theregions where the paintings were created.


帮忙分析下这个题吧，谢谢


D项 到底是什么意思呢？？

treewing929

簡單講, 就是指: 假設沒有其他材料在畫中會受環境影響而令畫受損