Answer:
The correct answer is Valley Forge.
Step-by-step explanation:
C is a correct answer because that is the place where Washington spent around half of year after a couple of unsuccessful battles. Still, they managed to regroup and to overcome difficulties. There is a monument in Valley Forge today.
A is wrong as it doesn't refer to some important event from Revolution.
B is wrong because this location is famous for a great battle that happened in 1777.
D is wrong as Fort Ticonderoga was a fort that was taken by Ethan Allen and Benedict Arnold in 1775.