C 为什么对 Maya is a group of people or Mayans (Americans, Britans etc).
In this case the arhcitects and stonesmasons are used to describe them as a people.
ex. The maya are known to be architects and stonemasons.
E is wrong because of "were the maya who" -- this doesn't clearly refer back to "Architects and Stonemasons". You can make the connection in your head yes, but grammatically this is wordy/awkward and incorrect.
论点1.扩大捐献者来源不好(新的不好)2.所以fund raiser 没做好工作(没募集足够钱)
削弱:A 只反驳了1. E反驳了1. 2.