Though ______ he said was of lit

Though ______ he said was of little help to me, I thanked him all the same.
A、what
B、which
C、that
D、who
【正确答案】：A
【题目解析】：考察主语从句；what 在从句中做宾语成分，he said what ；句子大意:尽管他说的那些对我没有很大帮助,我还是很谢谢他 ​