A. Tag question
B. Pronoun case
C. Gerund case
D. None off these
🧠 Explanation:
- The sentence “She sings a song, doesn’t she?” ends with a **tag question**.
- A tag question is a short question added to the end of a statement to confirm or clarify information.
- It typically consists of an auxiliary verb and a pronoun, matching the subject and tense of the main sentence.
- Tag questions are commonly used in spoken English for checking agreement or seeking reassurance.