Final answer:
The Intolerable Acts led to the calling of the First Continental Congress, as they represented a significant overreach of British authority and prompted colonial unity and response.
Step-by-step explanation:
The event that most directly led to the calling of the First Continental Congress was C) The Intolerable Acts. After the Boston Tea Party, the British Parliament enacted a series of punitive measures known as the Coercive Acts or the Intolerable Acts, designed to punish the colony of Massachusetts and bring it under control. Many colonists found these acts to be an extreme infringement on their rights and liberties. The widespread anger and worry among the colonies regarding these oppressive laws prompted them to convene the First Continental Congress in 1774 to address these grievances.