Answer:
Correct answer is It happened after numerous defeats and retreats caused low troop morale.
Step-by-step explanation:
Second option is correct as after many defeats especially around New York morale was low and there was practically no new enlisting in the army. After this battle and Princeton everything changed.
A is not correct as British took the city in 1777.
C is not correct although they were defeated Hessians were not removed from the war.
D is not correct as British controlled the area.