Explanation:

- The theory of ‘Laissez-faire’ or ‘open competition’ means the government does not interfere in economic matters.

- Option 1: Interference – This goes against the idea of laissez-faire because the theory advocates for minimal or no government involvement.

- Option 2: Non-interference – This perfectly matches the theory, as it supports free markets without state interference.

- Option 3: Direct-Rules – Laissez-faire avoids direct regulations or strict rules from government authorities.

- Option 4: All of the above – This is not correct, as only non-interference aligns with laissez-faire principles.