Answer:
D) helped to secure parts of the northern frontier in South Carolina for the Americans.
Step-by-step explanation:
A is not correct as British army retreated to South Carolina after the battle.
B is not correct as he didn't lead army in this battle.
C is not correct as British army hold Charleston until 1782.
D is correct as while British army retreated to South Carolina, Patriots managed to take control of North Carolina and frontier between North and South Carolina.