Napoleon's Decisive Defeat at the Battle of Waterloo in 1815

Napoleon's decisive defeat at the battle of Waterloo in 1815 came at the hands of

A) the French army, which had turned its back on its former leader.
B) the British army, with some assistance from colonial troops.
C) the newly formed Continental Army of the United States of America.
D) the Prussian army and a coalition of British, Dutch, German, and Belgian troops.