Which of the following figures is related to the concept of natural rights?

The concept of natural rights is most closely associated with John Locke. Locke argued that individuals possess inherent rights simply by virtue of being human, which he described as life, liberty, and property. He believed that these rights are not granted by government but are intrinsic and must be protected by it. This idea laid the groundwork for modern democratic thought and influenced numerous foundational documents, including the United States Declaration of Independence.

In contrast, the other figures listed have different philosophies and focuses. Marx is primarily known for his critique of capitalism and his theories on socialism, emphasizing collective ownership rather than individual rights. Lenin expanded on Marx's ideas in the context of Russian politics, pushing for a revolutionary approach to establish a communist state. Montesquieu contributed significantly to political theory, particularly with his ideas on the separation of powers in government, but did not specifically develop the notion of natural rights in the way that Locke did.