Step 1: Understand Ex-ante vs Ex-post.
- Ex-ante: Refers to planned or expected values before an event occurs (e.g., planned investment).
- Ex-post: Refers to actual realized values after the event has occurred (e.g., actual investment).
Step 2: Apply to the question.
The term “Ex-post” always means “what actually happened” in reality, not what was planned.
Step 3: Eliminate options.
- (B) What will happen → future oriented, wrong.
- (C) Planned → Ex-ante, wrong.
- (D) What should plan be → normative, wrong.
Final Answer:
\[
\boxed{\text{What actually has happened}}
\]