What is the difference in meaning between 'principal' and 'principle'?

• A. Principal refers to a financial loan; Principle refers to a belief.
• B. Principal = head or main; Principle = fundamental rule.
• C. Principal means the best or most important; Principle means a fundamental truth.
• D. Principal and Principle are interchangeable.

Answer: (B)

The difference tested here is that principal and principle look similar but have different core meanings: principal refers to something main or head, while principle refers to a fundamental rule or truth. Use principal when you mean the main person, thing, or amount, as in the principal of a school or the principal objective. Use principle when you mean a basic rule or belief, as in the principle of honesty or the principle of gravity. That’s why the best choice pairs principal with “head or main” and principle with “fundamental rule.” The other options mix senses awkwardly or rely on less precise wording (like “best” for principal) and don’t capture the precise distinction between the two words. For example, the principal is the lead or main figure, whereas a principle is a guiding rule or truth.