What Strategy Worked Well for the Colonists in Fighting the British

What strategy worked well for the colonists in fighting the British during the American Revolution?

A) Washington's army used full-frontal assaults.
B) The Continental army and militias deployed hit-and-run tactics.
C) Washington preferred to let the Native Americans fight for the colonists.
D) The Continental Congress handed over most of the war effort to the French.
E) Washington kept the training of his men to a minimum to ensure that morale stayed high.