(A) Poland
(B) Belgium
(C) Spain
(D) France
🧠 Explanation:
- Waterloo is a town located in the modern-day country of Belgium.
- It is historically famous for the Battle of Waterloo, which took place on 18 June 1815.
- This battle marked the final defeat of Napoleon Bonaparte by the allied forces led by the Duke of Wellington and Prussian General Blücher.
- Although Napoleon had previously campaigned in countries like France and Poland, the decisive battle occurred in Belgium, making it the correct answer.