What was the month and year George Washington was appointed Commander-in-Chief of the Continental Army?

The correct answer is A. May 1775.

George Washington was appointed Commander-in-Chief of the Continental Army by the Second Continental Congress on June 15, 1775, but the military actions that led to his appointment began earlier, with significant events in May 1775, particularly during the time of the Battles of Lexington and Concord. This pivotal moment ultimately led to his selection. If you would like more detail on this, feel free to ask!