20 November is observed as –

World day for War Orphans
Universal Children's Day, recognized by the UN
World Autism Awareness Day, recognized by the UN
International Day for Biological Diversity, recognized by the UN

The correct answer is: B. Universal Children’s Day, recognized by the UN

Universal Children’s Day is an international observance celebrated on November 20 each year. It was established in 1954 by the United Nations General Assembly to promote international togetherness, awareness among children worldwide, and improving children’s welfare.

The day was also designated as a World Day for Peace by the United Nations in 1989.

The theme for Universal Children’s Day 2023 is “For every child, a safe and healthy future.”

The other options are incorrect because:

  • World day for War Orphans is observed on June 6.
  • World Autism Awareness Day is observed on April 2.
  • International Day for Biological Diversity is observed on May 22.