[求助]关于which的用法?

GWD21-Q27:

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