Which event defines "the shot heard round the world?

It was a shot fired in Yorktown.

It was the last shot fired in the Revolutionary War.

It was the first shot fired in the Revolutionary War.

It was a shot fired in England.

The phrase "the shot heard round the world" refers to the first shot fired in the American Revolutionary War.

Explanation:

The phrase, "the shot heard round the world" originates from the opening lines of "Concord Hymn" by Ralph Waldo Emerson and represents the first shot in the Concord's Old North Bridge, Massachusetts. Historically, no single shot could be referred to as the first shot of the war or battle.

Earlier, shots were discharged on that day in Lexington where a British fighter was injured and 8 Americans were killed, yet records of that occasion are contradictory. The first shots were witnessed by North Bridge clash that were shot by Americans under orders, the main British fatalities, the Americans' volley, and the first retreat of British.

Further in twenty first century the phrase pursued to be stock phrase generally referring extraordinary events.