请教一道大全题目

Determining the authenticity of purported pre-Columbian artifacts is never easy. Carbon-14 dating of these artifacts is often impossible due to contamination by radioactive palladium (which occurs naturally in the soils of Central and South America). However, historians and anthropologists have evolved two reliable criteria, which, utilized in combination, have proven effective for dating these artifacts. First, because authentic pre-Columbian artifacts characteristically occur in a coarse, granular matrix that is shifted by major earthquakes, they often exhibit the unique scratch patterns known as gridding. In addition, true pre-Columbian artifacts show a darkening in surface color that is caused by centuries of exposure to the minute amounts of magnesium in the soil of the Americas.

The criteria above would be LEAST useful in judging the authenticity of which of the following?

(A) An ax head of black obsidian, unearthed from a kitchen midden

(B) A pottery bowl with a red ocher design, found in the ruins of a temple

(C) A set of gold ear weights, ornamented with jasper pendants

(D) A black feather cape from a king’s burial vault

(E) A multicolored woven sash found near the gravesite of a slave

答案是D,这道题目不是很理解，请nn帮助一下，谢谢！

检验标准有两个：表面刮伤（1）和颜色发深（2），分别从物理损伤和颜色变化来验证其真实性。所以被检验的东西至少要在其中一个方面表现出在外观上可明显识别的属性。

A的（1）属性很容易识别，（2）有点困难，先放一放；B的（1）、（2）都很好从外观上判断，排除；C和B差不多，也可以直接排除；D，黑色羽毛斗篷（披肩），羽毛的东西，破就破了，还看得出什么刮痕？加上本身是黑颜色的，颜色再深也是黑的，深黑和浅黑这种东西就比较难讲了，而且更重要的，它是在国王的地下室中被发现的（只是据其声称，否则也不用判别真伪了），所以根本不符合两种检验标准所要求的环境条件；E的（1）属性检验也有点问题，但是（2）属性检验就一目了然了。