C. A long list shows how King George has harmed the colonies.
The structure of the body of the Declaration of Independence supports Jefferson's purpose by presenting a long list of complaints against King George and the British government. This list serves to explain the reasons why the colonies felt justified in declaring independence, and it helps to build a case against the British government by presenting specific examples of how it had harmed the colonies. This list is an important part of the structure of the Declaration, as it helps to establish the grievances that the colonies had with the British government and to justify their decision to break away from it.