mc...help

1.The blue van was stolen in Fo Tan. It was found near Aberdeen.
A. The blue van which was stolen in Fo Tan, was found near Aberdeen.
B. The blue van which it was stolen in Fo Tan was found near Aberdeen.
C. The blue van was stolen in Fo Tan which was found near Aberdeen.
D. The blue van, which was stolen in Fo Tan, was found near Aberdeen.

2008-01-11 14:53:27 補充：
In the beginning, I also pick [A], but then I found that the sentence has a comma after Fo Tan. If it is a defing clause, there should not be a comma after Fo Tan, except the questioner mistakenly put it there.

2008-01-11 14:55:47 補充：
however, if we considered [The blue van] is known to both of us (that is, both speaker and listener, then, a non-defining clause is acceptable here) That is the reason I chose [D]. If I am wrong, please let me know.

答案應該是：
A. The blue van which was stolen in Fo Tan, was found near Aberdeen.
其實A和D的分別是：
有逗號和没有逗號
有兩個逗號的是：
Non-defining clause, 意思是指主角（The blue van）身份已經明確，再加的資訊是可有可無。
没有逗號的是：
Defining relative clause, 意思是指主角(The blue van)的身份 尚未明確，再加的資訊是必需的。
而這句句子中The blue van 的身份尚未明確，因此要加入"which was stolen in Fo Tan" 來表示是哪一輛blue bus