Explanation:

- Option 1: 20 Dec

- This is the correct date for International Human Solidarity Day.

- It’s a day recognized by the UN to promote solidarity, especially in fulfilling international agreements like the Millennium Development Goals.

- Correct Answer!

- Option 2: 30 Nov

- Not related to International Human Solidarity Day.

- This day doesn’t signify any major international solidarity event.

- Option 3: 8 Dec

- Not linked to International Human Solidarity Day.

- Typically observed as the Feast of the Immaculate Conception.

- Option 4: 9 Jan

- Unrelated to International Human Solidarity Day.

- No prominent event for human solidarity is celebrated on this date.

- Option 5: None of these

- Incorrect for International Human Solidarity Day, as option 1 is correct.