The correct answer is option 3, which states that George Washington was made the Commander in Chief of the American forces at the Second Continental Congress in 1775.

Option 1, which suggests he was appointed after the Boston Tea Party in December 1773, is incorrect. The Boston Tea Party occurred prior to the Revolutionary War and did not directly result in Washington`s appointment as Commander in Chief.

Option 2 mentions the First Continental Congress in September 1774. While this Congress laid the groundwork for the Revolutionary War, George Washington was not appointed as Commander in Chief at this time.

Option 4 implies that Washington was made Commander in Chief at the Declaration of Independence on July 4th, 1776. However, Washington had already been serving as Commander in Chief for over a year prior to the Declaration of Independence.

Therefore, the correct option is option 3, as it accurately states that Washington was appointed Commander in Chief at the Second Continental Congress in 1775.