Battle of Waterloo brought the downfall of?

A.  Napoleon
B.  Napoleon II
C.  Bourbons
D.  French Nobility

Exlanation:

The defeat at Waterloo ended Napoleon’s rule as Emperor of the French and marked the end of his Hundred Days return from exile. This ended the First French Empire and set a chronological milestone between serial European wars and decades of relative peace, often referred to as the Pax Britannica.