求教~~~定从 引导词的省略问题

wytk

267. During the nineteenth century Emily Eden and Fanny Parks journeyed throughout India, sketching and keeping journals forming the basis of news reports about the princely states where they had visited.
(A) forming the basis of news reports about the princely states where they had
(B) that were forming the basis of news reports about the princely states
(C) to form the basis of news reports about the princely states which they have
(D) which had formed the basis of news reports about the princely states where they had
(E) that formed the basis of news reports about the princely states they

答案没有问题 B项中没有they这个信息
其中 E的最后 the princely states they  visited
they  visited 是 the princely states  后置的定语从句吗
xdf老师说 定语从句的引导词不能省略 那这里是不是省略了呢
等待NN解答~~~

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wytk

求教~ding