(A) to
(B) on
(C) of
(D) None of these
🧠 Explanation:
- The word “on” is used when referring to a position over a surface, such as a stage or platform.
- A dais is a raised platform, so someone would logically stand "on" it during a speech or lecture.
- Using “to” or “of” in this context would be grammatically incorrect and change the intended meaning.
- This sentence follows standard prepositional usage in English for spatial relationships.