请教一道og逻辑题

xiw512

A newly discovered painting seems to be the work of one of two seventeenth-century artists, either the northern German Johannes Drechen or the Frenchman Louis Birelle, who sometimes painted in the same style as Drechen. Analysis of the carved picture frame, which has been identified as the painting’s original seventeenth-century frame, showed that it is made of wood found widely in northern Germany at the time, but rare in the part of France where Birelle lived. This shows that the painting is most likely the work of Drechen.Which of the following is an assumption that the argument requires?

• A The frame was made from wood local to the region where the picture was painted.
• B Drechen is unlikely to have ever visited the home region of Birelle in France.
• C Sometimes a painting so resembles others of its era that no expert is able to confidently decide who painted it.
• D The painter of the picture chose the frame for the picture.
• E The carving style of the picture frame is not typical of any specific region of Europe.
  

这道题答案是a 但是 我觉得问的内容证明画框来自德国 所以是d画的
a 假设了画框来自本国的木头。只能证明画是在德国画的
但是并不证明是d画的啊

求大神解读一下 跪谢各位～

Ayanamir

题干里说，这幅画边框的材料在法国不会有，但在德国却很多，所以应该是德国的画家画的了。但有个可能是别的地方（比如法国）的画家画了，又带到德国去制作边框了。所以A就是排除了这个可能。D说画画的人选了边框，那么可能是法国人画的，然后带着画去德国选了边框，所以不对。