Final answer:
The passage of the Intolerable Acts by the British Parliament in response to the Boston Tea Party convinced South Carolina to send representatives to the First Continental Congress.
Step-by-step explanation:
The event that convinced South Carolina to send representatives to the First Continental Congress was the passage of the Intolerable Acts by the British Parliament in response to the Boston Tea Party in 1774. The Intolerable Acts included the closing of the port of Boston, the dissolution of the Massachusetts colonial government, and the imposition of martial law. These acts were seen as a violation of the rights of the colonies and led to widespread support for colonial unity and resistance to British rule.