The correct options are
A UNICEF
C WHO
D ILO
UNO works through organs like: UNICEF, WHO, ILO.
i) UNO : The United Nations is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights.
ii) UNICEF : The United Nations International Children's Fund is a United Nations agency responsible for providing humanitarian and developmental aid to children worldwide.
iii) WHO : The World Health Organization is a specialized agency of the United Nations responsible for international public health. The main objective of WHO is "the attainment by all peoples of the highest possible level of health."
iv) ILO : The International Labour Organization is a United Nations agency whose purpose is to advance social and economic justice through setting international labour standards. It was founded in 1919 under the League of Nations, it is the first and oldest specialised agency of the UN.