请教逻辑单题

leonc

Investigator:XYZ Coins has misled its clients by promoting some coins as "extremely rare"when in fact those coins are relatively common and readily available.
XYZagent:That is ridiculous.XZY Coins is one of the largest in the world.We authenticate the coins we sell through a nationally recognized firm and operate a licensed coin dealership.
The XYZ agent's reply is most vulnerable to the criticism that it
A)lists strengths of XYZ Coins while failing to address the investigator's charge
B)provides no definition for the inherently vague phrase "extremely rare"
答案是a，请教不选b的原由，谢谢~

回家过年

简单的说,A比B好很多
Investigator: XYZ 极为稀少,其实到处都是.
XYZ Agent: 列举一大堆与charge稀少无关的(最大的,国际认可的,代理都是认证的)
问为什么agent's reply 说的is most vulnerable 注意most 和 reply, 问题问的关键不是XYZ是否做了模糊虚假广告, 而是他的回答(方法,措辞,角度)有什么不好, A直接指出,B说XYZ没有怎么样(没说实际怎么样)
可以感觉一下, 必要时第六感也上,如果时间紧张就不必刨根问底

oddyuibe

并不是没有下定义因而vulneralbe,而是因为回避了investigator's charge,

B中是not give the defination for the...........
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