--- What do you think of the film Schindler’s List?
--- This is the best film _______ I have ever seen

1. A.
   that
2. B.
   what
3. C.
   who
4. D.
   whom

 --- What do you think of the film Schindler’s List?

   --- This is the best film _______ I have ever seen.

A. that              B. what              C. who               D. whom