20 March is observed as –

World day for War Orphans
United Nations Day for South-South Cooperation
World Day of Theatre for Children and Young People
World Suicide Prevention Day

The correct answer is: World Day of Theatre for Children and Young People.

World Day of Theatre for Children and Young People is celebrated on 20 March every year. It was established in 2001 by the International Association of Theatre for Children and Young People (ASSITEJ) to promote the importance of theatre in the lives of children and young people.

The day is celebrated with a variety of activities, including performances, workshops, and discussions. It is an opportunity to raise awareness of the benefits of theatre for children and young people, and to encourage more people to participate in theatre.

Here is a brief description of each option:

  • World day for War Orphans is observed on 6 June every year. It was established by the United Nations General Assembly in 2002 to raise awareness of the plight of war orphans and to promote their rights.
  • United Nations Day for South-South Cooperation is observed on 19 December every year. It was established by the United Nations General Assembly in 1986 to promote cooperation between developing countries.
  • World Suicide Prevention Day is observed on 10 September every year. It was established by the World Health Organization in 2003 to raise awareness of suicide and to promote suicide prevention.