Correct Answer:
C. Political Party
The concept of a 'state' in political science is defined by several essential elements, without which a political entity cannot be considered a sovereign state. These foundational elements are universally recognized.
- Sovereignty refers to the supreme and independent authority of a state over its territory and people, free from external control.
- Population is the body of people living within the state. A state cannot exist without people.
- Defined Territory signifies a specific geographical area with recognized boundaries over which the state exercises jurisdiction.
A Political Party, while crucial for democratic governance and political participation, is an organization *within* a state that seeks to achieve and maintain political power. It is not an inherent or essential element for the fundamental existence of a state itself. Therefore, 'Political Party' is the correct answer as it is not an essential element.