D is the best answer. Why? If D, "The better the quality of original carpentry in a building, the less likely that building is to fall into disuse and be demolished", is true, then it is less likely for buildings with bad carpentry work to survive to today. Therefore, the overall carpentry quality of the buildings that survived to today is likely inflated -- the author’s argument is severely weakened. E is not relevant, because there is not necessarily any direct relationship between the "length of apprenticeship" and the "quality of the carpentry work". |