A. attempts to assess how a certain change will affect potential members of a group by providing evidence about its effect on the current members.
看了又看，感觉A中的potential members有问题，不知指什么？ 大家选A的理由是：把BAN已造成的影响误作BAN之前的状况。可是A说的是把对current members的影响当作对potential members的影响
支持C | 
