What Role Did Native Americans Play in the Revolutionary War

What role did Native Americans play in the Revolutionary War?

A) They all allied themselves with the British, who promised to protect them against American encroachment.
B) They all allied themselves with the Americans, since the British had failed to protect them against American encroachment.
C) Most tribes officially maintained neutrality but secretly aided one side or the other.
D) They divided their allegiance, just as white Americans did.