The correct answer is A) the boycott of British goods by American merchants.
The most immediately effective protest against the Stamp Act was the boycott of British goods by American merchants.
The American colonists were really angry with the English crown for the many heavy taxations imposed on the colonies. The Stamp Act was one of the many taxations that were injust. That is why the American people reacted promptly boycotting English goods.
Heavy taxation such as the Stamp Act, the Sugar Acts, the Navigations, Acts, the Tea Acts, and many more, were causes of the beginning of the Revolutionary War of Independence against the British troops. Another big problem was the fact that colonists had no voice or representation in the British Parliament.