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1. Has the largest population
3. Has the greatest highest elevation of the four options
Sri Lanka: 2,524 m, Romania: 2,544 m, Yemen: 3,665 m, North Korea: 2,744 m
4. Has the largest land area
5. Its capital is Yaoundé
6. Is NOT a monarchy (any kind of monarchy, not just absolute)
7. Has hosted the Olympics
8. Has the tallest average people (of both genders)
9. Has the lowest external debt
Afghanistan:1.28 billion, Djibouti: 1.34 billion, Belize: 1.33 billion, Equatorial Guinea: 1.36 billion
10. Most densely populated
11. Most time zones (including territories)
12. Has a lake called "Nipigon"
13. Was NOT colonized by the British
14. Has the most official languages
This answer surprised me so here's the source: https://en.wikipedia.org/wiki/List_of_countries_by_the_number_of_recognized_official_languages
15. With the highest median age
Mauritania: 21.9, Papua New Guinea: 21.6, Ghana: 21.3 East Timor: 20.3