More than 10,000 relics, between 5,000 to 3,000 B.C., at Sanxingdui since it was first d

More than 10,000 relics,      between 5,000 to 3,000 B.C.,      at Sanxingdui since it was first discovered.
A. dating back to, was dug up           B. dating back to, have been dug up
C. dated back to, has been dug up       D. dated back to, were dug up