Was it near the white building, if I may ask, __ __ Martin Luther King gave a speech "I have a dream"?

A. where     B. that      C. why    D. in which

23. Was it near the white building, if I may ask, ____ Martin Luther King gave a speech “I have a dream”?

A. where                     B. that                  C. why                        D. in which

Was it near the white building, if I may ask,______ Martin Luther King gave a speech "I have a dream"?

1. A.
   where
2. B.
   that
3. C.
   why
4. D.
   in which

 Was it near the white building, if I may ask, ____ Martin Luther King gave a speech “I have a dream”?

A. where        B. that           C. why         D. in which