What action could have averted the revolutionary war?

the british taking responsibility for the boston massacre.
the colonists taking responsibility for the boston massacre.
the british accepting the olive branch petition.
the colonists moving into the ohio river valley which would have spread out the population of the colonies resulting in fewer public gatherings

The correct answer is The British accepting the Olive Branch Petition.

The Olive Branch Petition, developed by the Continental Congress, was the American colonists last plea to King George III. The goal of this petition was ease tensions between the British and American colonists after several different conflicts. However, King George III did not accept the Olive Branch Petition. He actually didn't even read it. Upon receiving it, he declare the colonists in rebellion.