Final answer:
King George III responded to the Olive Branch Petition with a final warning, declared the American colonies in rebellion, and refused to read or respond to the document.
Step-by-step explanation:
King George III reacted to the Olive Branch Petition by responding with one final warning to the colonies, declaring all American colonies in open rebellion against Britain, and refusing to read or respond to the document. He did not have the colonial emissary hung for treason or reluctantly receive the colonial emissary.
Learn more about King George III's reaction to the Olive Branch Petition