_____ organization has revealed that 1 in 5 children (23 million) were married off before the age of 15 ?

1) United States Children’s Bureau
2) Child Welfare Information Gateway
3) United Nations Educational, Scientific and Cultural Organization(UNESCO)
4) United Nations Children’s Fund (UNICEF)

Explanation:
After the first-ever in-depth analysis of child grooms, the United Nations Children’s Fund (UNICEF) study revealed that an estimated 115 million boys and men around the world were married as children. Of which 1 in 5 children (23 million) were married off before the age of 15. The data was collected from 82 countries on the basis of national estimates in the UNICEF global databases. The study revealed that child marriage among boyes was prevalent across countries like the sub-Saharan Africa, Latin America and the Caribbean, South Asia, and East Asia and the Pacific.