主系表结构可以加伴随状语吗，求指教

Vivien.c

在prep 08笔记中看到说主系表结构不可以有伴随状语，不大明白为什么，求指教
163.

Because there areprovisions of the new maritime code that provide that even tiny islets can bethe basis for claims to the fisheries and oil fields of large sea areas, theyhave already stimulated international disputes over uninhabited islands.

A.    Because there are provisions of the new maritime code that provide thateven tiny islets can be the basis for claims to the fisheries and oil fields oflarge sea areas, they have already stimulated

B.    Because the new maritime code provides that even tiny islets can be thebasis for claims to the fisheries and oil fields of large sea areas, it hasalready stimulated

C.    Even tiny islets can be the basis for claims to the fisheries and oilfields of large sea areas under provisions of the new maritime code, alreadystimulating

D.     Because even tiny isletscan be the basis for claims to the fisheries and oil fields of large sea areasunder provisions of the new maritime code, this has already stimulated     (B)

E.    Because even tiny islets can be the basis for claims to the fisheriesand oil fields of large sea areas under provisions of the new maritime code,which is already stimulating

(C) 原本的主句被改成了修饰成分,句子重心改变；stimulating逻辑主语成了tiny islets错误；由于前面是主系表结构，所以stimulating不做伴随结果状语，割裂前后因果关系；under provisions of thenew maritime code错误修饰sea areas