The correct option is A European Union
The New Delhi World Book Fair started at Pragati Maidan in New Delhi on January 6, 2018. It was organised by the National Book Trust (NBT) in association with India Trade Promotion Organisation (ITPO). The main theme of 2018 fair was "Environment and climate change" and the European Union was the focus country. More than 40 countries including Belgium, Canada, China, Denmark, Egypt, France, Germany, and the United Kingdom participated in the book fair.