Answer:
Option D, formed armed militias, is the right answer.
Explanation:
The opening stage of the American Revolutionary War was the Siege of Boston. New England militiamen blocked the action by land of the British Army, which was fortified the city of Boston. Throughout the siege both the sides had to deal with the supply of resource and personnel problems. The beginning of the siege can be traced back to 19th April 1775, following the Battles of Lexington and Concord. This was the time when the militia formed the Continental Army and designated George Washington as its Commander in Chief. The formation of the Continental Army caused great tension to Britain.
