Explanation:

- Option 1: Gandhi Irwin Pact

- This was an agreement in 1931 between Mahatma Gandhi and the then Viceroy of India, Lord Irwin. It mainly focused on civil disobedience and laying foundations for talks towards independence.

- Option 2: Poona Pact

- This was an agreement between Dr. B.R. Ambedkar and Mahatma Gandhi in 1932, dealing primarily with the representation of 'Depressed Classes' in the legislative assemblies.

- Option 3: Second Round Table Conference

- This was one of the three conferences organized by the British government to discuss constitutional reforms in India. It didn't directly contribute to the origin of Directive Principles.

- Option 4: Karachi Resolution

- The Karachi Resolution passed in 1931 by the Indian National Congress outlined fundamental rights and socio-economic principles, providing a basis for the Directive Principles of State Policy in the Indian Constitution.