15. 20 November is observed as - A.World day for War Orphans B.Universal Children's Day, recognized by the UN C.World Autism Awareness Day, recognized by the UN D.International Day for Biological Diversity, recognized by the UN
Option B Solution: World Children's Day was first established in 1954 as Universal Children's Day and is celebrated on 20 November each year to promote international togetherness, awareness among children worldwide, and improving children's welfare.
