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Option 3 : the principle
The correct answer is ‘the principle’ as it refers to a theory or a concept that serves as the foundation for a system or belief. So there would be a principle of free movement.
A principal is the most important or senior person in an organisation. E.G. Principal of a school.
Principle starts with a consonant, therefore, we cannot use the article ‘an’ before it.
Therefore, the correct answer is option 3.
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