Final answer:
The statement that Thomas Jefferson's rationale in the Declaration of Independence was primarily influenced by John Locke's theories is true, reflecting Locke's notable impact on Jefferson's thinking about natural rights and governance.
Step-by-step explanation:
The claim that the rationale Thomas Jefferson used in the Declaration of Independence came primarily from the theories of John Locke is true. This statement has been examined and echoed across multiple instances, suggesting a broad consensus among scholars and academic resources that acknowledge the influence of Locke's philosophies on Jefferson's writing. Locke's ideas about natural rights, the purpose of government, and the rights of people to overthrow an unjust government were foundational concepts that Jefferson incorporated into the Declaration.