求教 一题目 about"claim recorder 录音机"

The electronics company has unveiled what it claims to be the world’s smallest network digital camcorder, the length of which is that of a handheld computer, and it weighs less than 11 ounces.

B.                to be the smallest network digital camcorder in the world, which is as long as a handheld computer, weighing

C.                is the smallest network digital camcorder in the world, which is as long as a handheld computer, and it weighs

D.                is the world’s smallest network digital camcorder, which is as long as a handheld computer and weighs

E.                is the world’s smallest network digital camcorder, the length of which is that of a handheld computer, weighing

请问这里未划线部分的what it claims的it claims 是不是插入语呢?

谢谢.

答案是不是D？

I choose B;

as long as expresses the accurate meaning.

claim to be; claim that are idiomatic

我选D。宾语从句套主语从句。

what it claims 作宾语从句里面的主语。

B肯定错。
to be the smallest network digital camcorder in the world, which is as long as a handheld computer, weighing

which 指代不清，weighing修饰a handheld computer错，应该修饰the world's smallest network digital camcorder.

I will vote for D

我也选D

A和C中的it weighs中的it指代有歧义，有可能指代句子主语：The electronics company

B和E中的weighing伴随也有以上问题，有可能伴随主句谓语：has unveiled

我也觉得D 好,  一个理由是 which is as long as 肯定比 the length of which is that of a handheld computer 更准确, 简洁

另外, it claims 不一定要被认为是插入语,  WHAT IT CLAIMS 在WHAT 引导的宾语从句里作主语, 如果非要给它语法上的称呼, 不如看成一个名词短语, 或小的主语从句.  比如: what I said , or what I mean.....