Final answer:
The assertion that Jefferson’s rationale in the Declaration of Independence was primarily drawn from John Locke's theories is true. Locke's concepts of natural rights and the social contract are clearly reflected in the Declaration.
Step-by-step explanation:
The statement that the rationale Thomas Jefferson used in the Declaration of Independence came primarily from the theories of John Locke is true. John Locke was a significant influence on Jefferson, particularly with his ideas of natural rights to life, liberty, and property, which Jefferson adapted to 'life, liberty, and the pursuit of happiness' in the Declaration. Locke's philosophy that government is morally obliged to serve people by protecting life, liberty, and property, and that the people have the right to overthrow a government that fails to do so is a foundational principle that shapes the document.