__ is known to the world,Andersen is a great Danish writer famous for his many fairy tales.

问题描述:

__ is known to the world,Andersen is a great Danish writer famous for his many fairy tales.
__ is known to the world,Andersen is a great Danish writer famous for his many fairy tales.A.Which B.It C.That D.As选哪个啊?

As,引导定语从句.