Answer: C. John Locke
Although this line could reflect the ideas of several Enlightenment philosophers, it is most usually associated with John Locke.
Many scholars believe that Jefferson's thought was greatly influenced by the philosophy of John Locke. In his First and SecondTreatises of Government, Locke argued that the state existed for the purpose of protecting people's property, which he defined as "life, liberty and state." Moreover, in his Essay Concerning Human Understanding, he claims that the highest objective of intellectual nature consists on the pursuit of "true and solid happiness."