From the given options, choose the one word which will correctly replace the expression.

"Fundamental truth or proposition"

Principle

The word that correctly replaces the expression "fundamental truth or proposition" is principle.

• Principal means "the chief or most important person or thing."
• Principle means "a fundamental truth or proposition that serves as the foundation for a system of belief or behavior."
• Prime meridian means "the imaginary line that passes through Greenwich, England, and is used as the basis for measuring time around the world."
• Primate means "a member of the order Primates, which includes humans, apes, monkeys, and lemurs."