Question

Why was America’s victory at Yorktown among the most significant battles of the American Revolution? It made the British realize they were fighting a lost cause and soon after, they conceded the war. It forced colonists who had so far remained neutral to pick a side and enlist in the war. It helped the Continental Army remove all British barracks from New Jersey. It helped secure France’s military and financial aid for the American cause. It was the colonists’ first victory against the British during the Revolution. NextReset

Answer 1

It Helped the Continental Army Remove all British barracks from New Jersey.
The Victory in Yorktown was really a Great Victory!
The US Army was following the British Army to a small peninsula.
The British Army thought that they'll get reinforcements from France, which was wrong. 
The French reinforcements came to the American side, and helped in stopping the Arrival of many British ships.
Here, the king decided to sign peace and leave America.
So, we can say that Yorktown was where USA took her Liberty.

Hope this Helps! :)

Answer 2

The Continental Army's triumphs at Princeton and Trenton went a long way in boosting the patriots' morale. These battles also caused the British barracks to be moved from New Jersey to New York.

So it is not C.  I believe it to be A, it wasn't long after Yorktown that King George decided with the help of the people of England, they had had enough.