[求助]GWD-21-27, B VS. D, 讨个说法！！急

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.

A. to be the world’s smallest network digital camcorder, the length of which is that of a handheld computer, and it weighs

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

我刚开始选D, 后来改成的B, 我们能把weighing...看为独立主格结构不？请XDJM给个最后的说法？感谢