The correct answer is option 'C': right to information.

Explanation:
The political theorists of the 17th and 18th centuries, often referred to as the Enlightenment era, were influential in shaping the ideas of natural rights and the foundation of modern political thought. They emphasized individual liberty, limited government, and the social contract theory. However, the right to information was not explicitly advocated by these theorists during this period.

1. Natural Rights:
- Natural rights are rights that are believed to be inherent to all individuals by virtue of their humanity. These rights are not granted by any government or authority but are considered to be universal and inalienable.
- The most commonly recognized natural rights are the right to life, liberty, and property, as famously stated by John Locke in his Two Treatises of Government.

2. The Right to Life, Liberty, and Property:
- The right to life is the right to be protected from arbitrary deprivation of life. This means that individuals have the right to be free from violence, oppression, and unjust harm.
- The right to liberty refers to the freedom to act and make choices without undue interference or coercion by others or the state.
- The right to property entails the right to own, use, and dispose of one's possessions and resources.

3. The Right to Information:
- The right to information, or the right to know, is the concept that individuals have a fundamental right to access information held by public authorities or other entities. It includes the right to seek, receive, and impart information freely.
- While the right to information is considered a fundamental human right today and is enshrined in various national and international legal frameworks, it was not explicitly advocated by political theorists during the 17th and 18th centuries.

Conclusion:
In summary, while the political theorists of the 17th and 18th centuries emphasized the natural rights of life, liberty, and property, they did not explicitly advocate for the right to information. This right gained recognition and prominence in later centuries as societies evolved and recognized the importance of transparency, accountability, and access to information in democratic governance.