The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.

1. A.
   which
2. B.
   that
3. C.
   across which
4. D.
   through which

The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.

A. which                       B. that                             C. across which         D. through which

The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.

A. which                 B. that                      C. across which       D. through which

The entry point tissue in the very front of eye functions as the window ______ all light has to pass on its way.