What Pushed Britain to Negotiate an End to the Revolutionary

What pushed Britain to negotiate an end to the Revolutionary War?

A) The "Armed Neutrality" was planning to join the war effort on the American-French side.
B) There were indications that the Americans might settle for peace terms short of complete independence.
C) They were suffering heavy military losses against the French and Spanish elsewhere.
D) Their Indian allies on the American frontier abandoned them after Yorktown.
E) Their military strength in America had been completely crushed.