During the Revolution, the Western Frontier Saw Much Fighting, Which

During the Revolution, the western frontier saw much fighting, which

A) slowed the westward advance of the pioneers.
B) caused most of the Indians to join the colonists' cause against the British.
C) led to George Rogers Clark's downfall as a military leader.
D) failed to stem the tide of westward-moving pioneers.
E) ultimately led Benedict Arnold to go over to the British.