Answer:
Correct answer is almost all of South Carolina was now controlled by the British .
Step-by-step explanation:
First option is not correct as this was not the turning point of the war. The turning point is a battle of Yorktown, which was won by the Continental Army.
Second option is not correct as British forces controlled Charlestown since May, while the battle happened in August.
Third option is correct as after this victory British army had a massive advantage in the southern part of the country.
Fourth option is not correct, because as we said Britain already controlled Charlestown.