Correct Answer:
B. 9th
The correct answer is 9th. António Guterres of Portugal is the 9th Secretary‑General of the United Nations. He took office on 1 January 2017, succeeding Ban Ki‑moon (the 8th). Among the options:
- 7th: Incorrect; that was Kofi Annan.
- 9th: Correct; Guterres is the 9th Secretary‑General.
- 10th: Incorrect; no one has served as the 10th yet.
- 11th: Incorrect.
Hence, the correct answer is "9th".