whether在这里的词性是？

Question

33. All people, B they are old or young, rich or poor, have been trying their best to help those in need since the disaster. (08重庆)
A. even if B. whether C. no matter D. however
whether引导的是非限定性定语从句吗

Answer 1

whether本身是连词 可以把它归为why How 这样的疑问词 在引导名词性从句时用法完全一样，这里是同位语从句。

Answer 2

是的....