B.Hotels built since 1930 can generally accommodate more guests than those built before 1930. Hotel住人的多少和木工活儿的质量是无关比较。 如果您认为“1930以后的hotel住人更多,因此木头家具更容易受损,因此看起来质量更差”,那么就是过度推理。
D.The better the quality of original carpentry in a building, the less likely that building is to fall into disuse and be demolished. 这明显是给出它因的削弱。因此选D。