whatever是什么词性

请问这道题中，whatever是什么词性，这句话的句子结构怎么样拆分？谢谢！

I believe I can deal with whatever _____.
A. that needs handling

B. which needs handling
C. it needs handling

D. needs to be handling

答案A

四个选项都是不对的。

加一个选项E：needs handling. 才是正确答案。

I believe I can deal with whatever needs handling.

= I believe I can deal with anything that needs handling.

A选项的错误在于，whatever为融合型关系代词，= anything that，本身已经包括了关系代词，再用关系代词that为错误。