Final answer:
Both classical republicanism and natural rights philosophy played critical roles in the development of the United States' foundation, with the former emphasizing civic virtue and representation, and the latter focusing on inherent individual rights.
Step-by-step explanation:
The correct answer is d) Both classical republicanism and natural rights philosophy influenced the ideas of the foundation of the United States.
Classical republicanism and natural rights philosophy both played crucial roles in shaping the political framework of the United States. The Founding Fathers were greatly influenced by the Enlightenment thinkers, such as John Locke, who emphasized the social contract and the intrinsic natural rights to life, liberty, and property. These ideas were encapsulated in founding documents like the Declaration of Independence and Constitution, which reflect the blend of republican principles, such as civic virtue and mixed government, with the protection of individual rights. Classical republicanism promoted the idea of a government composed of representatives elected by the people to serve the common good, while natural rights philosophy underscored the government's role in securing the unalienable rights of individuals.