Final answer:
Speaker D's views on natural and inalienable rights are most representative of the philosophies of John Locke and Jean-Jacques Rousseau.
Step-by-step explanation:
The speaker that expresses views most similar to those of John Locke and Jean-Jacques Rousseau is Speaker D: "Men are born and remain free and equal in rights. It is the duty of every government to preserve and protect these natural and inalienable rights." This statement aligns closely with Locke's philosophy of natural rights to life, liberty, and property, and Rousseau's concept of the general will and his assertion that governments are founded on the consent of the governed to protect these freedoms.