请教：关于which是否指代不明的问题

我记得做OG的时候，A of B，which。。。这样的句子，which可以指代A的呀，应该是很多题目大家的结论。所以，我就不明白下面这道prep 96这道题目，为什么NN说C里面的which指代不明了？

究竟什么时候认为which修饰前面的B，什么时候认为which修饰前面的A那？已经被弄糊涂了。

96. From studies of the bony house of the brain, which is the cranium, located in the back of the skull, come what scientists know about dinosaur brains.

A. From studies of the bony house of the brain, which is the cranium, located in the back of the skull, come what scientists know about dinosaur brains.

B. The knowledge of dinosaur brains that scientists have come from studies of the bony house of the brain, located in the back of the skull, that is, the cranium

C. The knowledge that scientists know about dinosaur brains comes from studies of the bony house of the brain, which is located in the back of the skull and is called the cranium

D. What scientists know about dinosaur brains comes from studies of the cranium, the bony house of the brain located in the back of the skull

E. Located in the back of the skull is the cranium, the bony house of the brain, and it is from studies of this that scientists know what they know about dinosaur brains

B: come应该用单数动词；located修饰不明；that is 指代不明

C: which指代不明；

D: correct

E: 无谓语

LZ说得没有错，which这个不是绝对的错，A of B，which这种结构必然会产生指代不清。

所以要根据具体问题来找出具体选项。