New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed, 

A. as       B. which        C. what     D. that

New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed,

1. A.
   as
2. B.
   which
3. C.
   what
4. D.
   that

 New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed, 

A. as       B. which        C. what     D. that

New tombs found in Giza support the view that the Great Pyramids were built by free workers and not slaves, ______ widely believed,