D. The result of Waterloo battle was that...
1) the Duke of Wellington decided to become the boss of Europe
2) Napoleon's army was defeated and he was sent to Saint Helena island for the rest of his life
3) Napoleon was killed in the battle
В тексте указано: "In the end, the allies won the battle. Napoleon's army was defeated, and he had to give up power. After the battle, Napoleon was sent away to a small island called Saint Helena, where he stayed for the rest of his life."
Ответ: 2) Napoleon's army was defeated and he was sent to Saint Helena island for the rest of his life