Correct option is A
The correct option is (a).
Explanation:
The correct option to fill in the blank is (a) about. The preposition 'about' is used to indicate the subject or topic of a story, conversation, or book. (के बारे में)
Example: Tell me a story about your childhood.
Why other options are incorrect:
- on: Usually used for a specific topic of a lecture or academic discourse (e.g., a lecture on history).
- for: Indicates purpose or recipient, not the subject of a story.
- in: Indicates a location or medium, which does not fit here.