UNECE was set up in 1947 by ECOSOC. UNECE is “one of five regional commissions of the United Nations. UNECE’s major aim is to promote pan-European economic integration” (www.unece. org). UNECE’s work on sustainable energy is designed to improve access to affordable and clean energy for all and help reduce greenhouse gas emissions and the carbon footprint of the energy sector in the region. Therefore, the correct option is D.