Well, the chinese big secret was silk. So that would be my best guess.
Answer:
D-Day/Normandy Landings
Explanation:
The allied invasion of D-Day was when aircraft, ships, and thousands of British, American, and Canadian troops came on the shores of France to restore Europe from WW2.
While the Continental Army lose the Battle of Bunker Hill, they still gained a tremendous confidence boost. Because of this, the Continental Army was able to win the next battle, the Battle of Gloucester.
From what I can see C would be the best answer
