Just like the background in art history needed by an archaeologist in order to evaluate finds of ancient art, the nautical archaeologist needs specialized knowledge of the history and theory of ship design in order to understand shipwrecks.

A.just like the background in art history needed by an archaeologist in order to evaluate finds of ancient art, the

B.just as an archaeologist who needs a background in art history to evaluate finds of ancient art, a

C.just as an archaeologist needs a background in art history to evaluate finds of ancient art, so a

D.like the archaeologist who evaluate finds of ancient art history and requires a background in art history ,so the

E.as evaluating finds of ancient art requires an archaeologist who has a background in art history, so the

正解C，请问C后面半个句子很诡异地用so开头，为什么啊？还是一个完整的句子吗？（貌似问的很外行吖~O(∩_∩~)O~请NN指教）